A block of mass is released from rest at a height above the top of a light vertical…
PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
A block of mass m is released from rest at a height h above the top of a light vertical spring fixed to the floor. The spring is initially uncompressed. Neglect air resistance. At the instant the spring is maximally compressed, which of the following statements about the system (block + spring + Earth) is correct?
(a) The total mechanical energy of the system is zero.
(b) The kinetic energy of the block is zero.
(c) The elastic potential energy of the spring is zero.
(d) The elastic potential energy stored in the spring equals the initial gravitational potential energy mgh.