A ball of mass `m_(1)` and another ball of mass `m_(2)` are dropped from equal height. If the time taken by the balls are `t_(1)` and `t_(2)`, respectively, then

A ball of mass m_(1) , collides elastically and head on with ball of mass m_(2) at rest. Then

A ball of mass 1 kg and another of mass 2 kg are dropped from a tall building whose height is 80 m. After, a fall of 40 m each towards Earth, their respective kinetic energies will be in the ratio of

Two balls are dropped from heights h and 2h respectively. The ratio of time taken by these balls to reach the earth is

Two bodies having masses m_(1) and m_(2) are dropped from heights h_(1) and h_(2) respectively. They reach the ground after times t_(1) and t_(2) and strike the ground with velocities v_(1) and v_(2) respectively. Choose the correct relations from the following:

In the figure shown, the heacvy ball of mass 2m rests on the horizontal surface and the lighter balls of mass m is dropped from a height hgt2l. At the instant the string gets taut, the upward velocity of the heavy ball will be :