John throws a rock down with speed 11m/s from the top of a 25-m tower. If g=9.8m/s^2 and air resistance is negligible, what is the rock's speed just as it hits the ground?

Q: A boy rides a bicycle a distance of 10 m, carrying a bag which weighs 50 N. What is the work done on…

A: Force, F = 50 NDisplacement, d = 10 m The work done on the bag will be given by the formula W = F.d…

Q: A 5.5 kg boulder rolling down a hill has kinetic energy of 250 J. How fast is it moving? 64 m/s 10…

A: Given that,                    mass of boulder rolling down (M) :-  5.5 kg…

Q: You toss a stone of mass m straight upward with kinetic energy K. If the stone reached a maximum…

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Q: 23 kg child descends a 4.5 m high frictionless slide. What speed will the child reach the ground at…

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Q: An automobile to be transported by ship is raised 7.0 m above the dock. If its gravitational…

A: Given, The gravitational potential energy of automobile's, U = 6.6 ×104 J height above the ground, h…

Q: A two-man bobsled has a mass of 390 kg. Starting from rest, the two racers push the sled for the…

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Q: How fast will it be going when it hits the ground

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Q: "A car on a roller coaster starts at zero speed at an elevation above the ground of 26 m. It coasts…

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Q: A boulder (a huge rock) has 5000 J of potential energy at the top of a cliff. If the cliff is 255 m…

A: Given: The potential energy is E=5000 J. The height is h=255m. The expression for mass (m) of the…

Q: You have an object of mass 555 kg, that is a distance 1.0 m above the ground. If we call the ground…

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Q: A certain box has a mass of 42.7kg. You exert a constant upward force of 650N on the box to lift is…

A: Force is defined as product of mass and acceleration F=ma Given : mass of box is 42.7 kg Upward…

Q: At an amusement park, a swimmer uses a water slide to enter the main pool. If the swimmer starts at…

A: Given Data :initial speed u = 0 msinitial height hi  = 2.55 mlet v denotes the speed at the bottom…

Q: You have a 750-kg roller coaster that starts from rest at a height of 37.5m above the ground. The…

A: Mass of the roller coaster (m)=750 kg Height of roller coaster above the ground (H)=37.5 m Length of…

Q: A roller coaster is moving at 10 m/s at the top of the first hill (h= 40 m). Ignoring friction and…

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Q: A man pushes a lawn mower on a level lawn with a force of 191 N. If 25% of this force is directed…

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Q: A ball weighing 0.25 kg falls from a height of 3.20 m and bounces to a height of 2.40 m. What is…

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Q: Fleas have remarkable jumping ability. A 0.40 mg flea, jumping straight up, would reach a height of…

A: Given:  mass, m = 0.4 mg = 0.4 x 10-6 kg maximum height reached, h = 35 cm = 0.35 m

Q: If an object with a mass of 1.8 kg changes it speed from 3.15 m/s to 8.8 m/s, what is its change in…

A: Given : m = 1.8 kg vi = 3.15 m/s vf = 8.8 m/s

Q: A cart is pulled at a constant speed along an inclined plane to the height of a seat top. If the…

A: Given data:  Mass (m) = 3.8 kg Height (h) = 0.53 m Required: The potential energy

Q: Captain America pushes a car out of the way with 1000 N of force. He manages to move it 8 meters.…

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Q: A 1,350 kg package is dropped from a plane from a height of 760 meters. What is its potential energy…

A: Given that,Mass of package : m = 1350 (kg)The height : h =760 (m)The acceleration due to gravity : g…

Q: A 2000 kg car can accelerate from rest to 50 m/s in 4.2 seconds. How much power does the engine…

A: The initial speed of a car is, u=0 m/s The final speed of a car is, v=50 m/s The car's mass is,…

Q: How much potential energy does a person of mass 82kg have if they are standing at the top of a…

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Q: A courageous warrior pushes a stone block 4.81 m. If they apply a force of 3780 N to do this, how…

A: Amount of work done by a force is equal to product of force and displacement. Work = Force x…

Q: A weight lifter raises a 107 kg barbell to a height of 1.8 m. what is the barbell's potential…

A: Mass of the barbell,   The height,

Q: A weight lifter raises a 89 kg barbell to a height of 1.9 m. what is the barbell's potential energy?…

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Q: Force [F] N) F: F1 X2 Stretch (Ax) (m) When a spring is stretched to x1 = 16.1 m, the force applied…

A: Work done in stretching the spring may be calculated by finding the area of the shaded trapezium…

Q: A Ferrari has a mass of 1565 kg races at its top speed of 349 kph. What is the kinetic energy of…

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Q: A weight lifter raises a 80 kg barbell to a height of 2.4 m. what is the barbell's potential energy?…

A: Potential energy = mgh g=9.81 m/s^2 h=2.4 m m=80 kg

Q: On Earth, an airplane (m = 2000 kg) flies 100 meters above the ground at a speed of 20 m/s.  How…

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Q: A roller-coaster car is moving at 20 m/s along a straight horizontal track. What will its speed be…

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Q: A car has a kinetic energy of 4.25*10^5 J when traveling at a speed of 25 m/s.  What is its mass?

A: Kinetic energy of car = 4.25 × 105 Joules  Speed of car = 25 m/s