An object is thrown straight up from the ground with a speed of 25 m/s. How long will the object be in the air (in s)? g = 10 m/s? A) 2.5 %3D B) 5 C) 1.5 D) 3
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Q: An athlete runs some distance before taking a jump. Explain?
A: The Law of inertia i.e., Newton’s First Law of Motion supports the above explanation.
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- A landscape architect is planning an artificial waterfall in a city park. Water flowing at 1.70 m/s will leave the end of a horizontal channel at the top of a vertical wall h = 2.35 m high, and from there it will fall into a pool (Fig. P3.42). (a) Will the space behind the waterfall be wide enough for a pedestrian walkway? (b) To sell her plan to the city council, the architect wants to build a model to standard scale, which is one-twelfth actual size. How fast should the water flow in the channel in the model? Figure P3.42A rock is thrown downward from the top of a 40.0 m tower with an initial speed of 12 m/s. Assuming negligible air resistance, what is the speed of the rock just before hitting the ground? a) 28 m/s b) 784 m/s c) 56 m/s d) More information is needed. e) 30 m (Help me answer this question with easiest formula possible)The height of a helicopter above the ground is given by h = 3t^2+2.0t^4, where h is in meters and t is in seconds. At t=2.0s, the helicopter releases a small bag. a) Calculate the maximum height the bag reaches measured from the ground. b) How long after the bad is released, does it strike the ground? c) Calculate the speed of vag when it hits the ground.
- An airplane accelerates at 3 m/s2 along a runway until it finally lifts off after 33 seconds. a) How far did the plane travel before taking off? b) How fast was the plane moving at the moment it took off?A drag racer starts from rest and accelerates at 10 m/s2 for the entire distance of 400 m (1/4 mile). What is the velocity of the race car at the end of the run? O 1) 35 m/s 2) 89 m/s 3) 130 m/s 4) 180 m/s O 5) 45 m/sAn object is thrown upward from a height of 45.0m above ground, with the speed of 12.0 m/s. a) How high the object rise? b) How long will it take the object reach the ground? c) What is the object’s velocity upon hitting the ground? d) Where is the object and what is its velocity 2.5 s after it was thrown?
- A bangus (milkfish) can attain a maximum swimming speed of 6.0 m/s. a). How high can bangus jump vertically out of the water at that speed? a) 1.84 m height above the waterb) 1.84 m height above the groundc) 2.84m the groundd) 2.85 m above the water2. A car is driven 1200 m north at 20.0 m/s and then driven 1600 m east at 25.0 m/s. What is the magnitude of the average velocity for this trip? a) 16.1 m/s b) 22.6 m/s c) 31.3 m/s d) 11.3 m/s e) 62.2 m/sA girl is standing at the edge of a cliff 100. m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed 8.00 m/s. a) How long does it take the rock to hit the ground? b) What is the speed of the rock the instant before it hits the ground? Please type answer
- A particle moves in a straight line such that its velocity (v) varies with position (x) as v = 2v7 where, v is in m's and x is in metre. The average velocity of particle between x=0 to x=16 m is 12 m/a B 4m/s 4/3m/s D. 16 3m/s SolutionA collie moves from a coordinate of x=-2m, y= 3m, z=1m to a coordinate of x=5m,y=6m,z=3m in a time of 2 seconds. What was the average speed of the collie during this time? A) 4.2 m/s B)2.1m/s c) 0.85 m/s D) 3.4 m/s e) it is impossible to determine with the information given.22) A dog jumps straight up to a height of 0.7 m. What is the initial velocity of the dog? a) 1 b) 3.7 c) 5 d) 9.81