A body is falling freely from rest from a height of 100m. The ratio of kinetic energy after 2 and 5 seconds is _____ a) 2:5 b) 4:25 c) 25:4 d) 5:2

The mass and speed of different objects are given below, which object has the greatest kinetic energy?   Question 2 options:   a)  Mass 3M and speed V   b)  Mass 3M and speed 2V   c)  Mass 2M and speed 3V   d)  Mass M and speed 4V   e)  All four of the above have the same kinetic energy

A roller coaster car is initially at rest at the top of the track, 10 meters above the ground. The car is released and moves down the track. Calculate the velocity of the car when it is 2 meters above the ground. Use the conservation of mechanical energy.

A roller coaster car has a massive 320 kg. Starting from the rest the car requires 3.5×10^5 joules of kinetic energy As it designs to the bottom of the hill in 4.5 seconds calculate in meters the height of the hill

A ball is dropped from a height at which it has 20 J of potential energy. How much kinetic energy does the ball have just before hitting the ground? (Assume the ground is at h = 0.)

4. The speed of a 1600 kg car increases uniformly from 20 m/s to 30 m/s. (a) What is the increase in its kinetic energy? (b) If the acceleration increases over a distance of 50 m, what force is accelerating the car?