Two masses m and 2m are dropped from height h and 2h. On reaching the ground, which will have a greater kinetic energy and why ?

A rock of mass m is dropped to the ground from a height h . A second rock, with mass 2m , is dropped from the same height. When the second rock strikes the ground, what is its kinetic energy? (a) Twice that of the first rock, (b) four times that of the first rock, (c) same as that of the first rock, (d) half as much as that of the first rock, (e) impossible to determine.

A ball initally at rest is dropped from a height of 10 m . In strinking the ground , it loses 20 % of its kinetic energy . Calculate the height to which it bounces . Where does the lost kinetic energy go ?

Two bodies of masses (m_(1)) and (m_(2)) are droppded from heithts h_(1) and h_(2) , respectively. They reach the ground after time t_(1) and t_(2) and strike the ground with v_(1) and v_(2) , respectively Choose the correct relations from the following.

Two stones of masses m and 2 m are projected vertically upwards so as to reach the same height. The ratio of the kinetic energies of their projection is

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 of masses m_1 and m_2 (m_1 = 2m_2) are dropped from a height. The ratio of time taken by them to reach the ground is ________.