Q: A smooth block of mass m is connected to a wall through a light spring of constant k. When the spring is in natural length, the block is projected rightward with speed v0, consider the duration in which the spring stretched upto maximum elongation. In the frame of the block ,
(a) The wall is moving toward the block
(b) The kinetic energy of block decreases
(c) The potential energy of the spring increases due to the positive work by normal reaction between the spring and wall
(d) The work done by spring on the block is zero.
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