An 80.0-kg skydiver jumps out of a balloon at an altitude of 1 000 m and opens the parachute at an altitude of 200.0 m. (a) Assuming that the total retarding force on the diver is constant at 50.0 N with the parachute closed and constant at 3 600 N with the parachute open, what is the speed of the diver when he lands on the ground? (b) Do you think the skydiver will get hurt? Explain. (c) At what height should the parachute be opened so that the final speed of the skydiver when he hits the ground is 5.00 m/s? (d) How realistic is the assumption that the total retarding force is constant? Explain.

Q: A softball having a mass of 0.25 kg is pitched horizontally at 120 km/h By the time it reaches the…

A: Given, Mass of softball is 0.25 kg and speed is 120 km/h and it slowed by 10% and distance between…

Q: A 2.36x10 kilogram car starts from rest and coasts down from the top of a 5.05 meter long driveway…

A:

Q: A 60.0 kg skier with an initial speed of 15 m/s coasts up a 2.50 m high rise as shown in the figure.…

A: Given data- Mass of skier =60 kg Initial speed vi=15 m/s Height h=2.50 m Coefficient of kinetic…

Q: A high diver of mass 70 kg jumps off a board 10 m above the water. If, 1.0 s after entering the…

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Q: A 146-g baseball is dropped from a tree 15.0 m above the ground. With what speed would it hit the…

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Q: A 145-g baseball is dropped from a tree 13.0 m above the ground. (a) With what speed would it hit…

A: When air resistance is ignored, then the total mechanical energy of the system is conserved. Thus Ei…

Q: A 2.31x103 kilogram car starts from rest and coasts down from the top of a 4.15 meter long driveway…

A:

Q: In a mountain region, from the border from the edge of a cliff, a man throws a rock that has 1kg of…

A: Given :  Mass of rock = 1 kg Angle = 30 degree Initial velocity = 12 m/s    g = 9.81 m/s2  time of…

Q: A 2.1 x 103-kg car starts from rest at the top of a 5.5-m-long driveway that is inclined at 15° with…

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Q: A plane is preparing to takeoff at one end of a runway. The length of the runway is 2.6 km, and the…

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Q: A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.850 m/s encounters a rough horizontal…

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Q: If a 2.1 kg object is initially at rest on a frictionless, horizontal surface and subjected to a  14…

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Q: A child slides down a snow‑covered slope on a sled. At the top of the slope, her mother gives her a…

A: From the law of conservation of energy,

Q: is the final speed?

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Q: A box weighing 3.9 kg is initially at rest on a horizontal floor. It is then pushed in a straight…

A: mass of box = m =3.9kg initial velocity = Vi = 0 m/s force = F = 36N Displacement= S=1.2m

Q: A 149-g baseball is dropped from a tree 15.0 m above the ground. a) With what speed would it hit…

A: M = 150g = 0.15kg H = 15.0m Initial velocity, u = 0 Acceleration, g = 10m/s2

Q: A car traveling at 22 m/s runs out of gas while traveling up a 200 slope. How far up the hill will…

A: The total mechanical energy of the car must be conserved. Take the initial point as the starting…

Q: A 2.1 ✕ 103-kg car starts from rest at the top of a 5.2-m-long driveway that is inclined at 24° with…

A: mass, m = 2100 kg  length, L = 5.2 m  Angle, A = 24° Friction force, f = 4000 N

Q: A pushing force of 10 000 N is applied to the backside of a car at an angle of 25.0° above the…

A: Force F = 10000N Horizontal angle θ=25∘ Distance s =15 m Mass of the car m = 2250 Kg

Q: The man slides the 180-lb crate across the floor by pulling with a constant force of 30 lb. If the…

A: The third equation of  motion is  v2 = u2 + 2 a s where, u is the initial velocity, v is the final…

Q: At the start of a race, a four-man bobsled team pushes their sled as fast as they can along a 50 m…

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Spring Potential Energy

The potential energy is the energy possessed by a body by virtue of its position or the energy held by the object due to its position relative to other objects, its force like stresses, charge, and other factors affecting the particles of the body. The potential energy is the measure of the net work done by or on the body. The spring potential energy is the potential energy stored due to the deformation of an elastic spring and this elasticity is due to the stretched spring. The elasticity is the ability of a solid-state matter to come back to its equilibrium position or original position after any kind of external force is acted on it. It is also known as Elastic potential energy. The potential energy here is caused due to the displacement of the spring from its equilibrium position to another position and this potential energy is equal to the net work done due to the stretching of the spring. It also resembles the same mechanics of the oscillation of a simple pendulum, where due to the external force, the object moves from its equilibrium position to its maximum ends and the periodic motion continues till it comes back to the equilibrium position to rest.