Question

A smooth block of mass 'm' i concentrated to a wall through a light spring of constant K. When the spring is in natural length, the block is
projected rightward with speed Vo. Consider the duration in which the spring stretched upto maximum elongation, in the frame of the block
K
Vo
(A) the wall is moving the block
(B) the kinetic energy of block decreases
(C) PE of the spring increases due to positive work by normal reaction between spring and wall
(D) the work done by spring on the block is zero​

Answer 1

Answer:

⁉️⁉️⁉️⁉️⁉️⁉️⁉️⁉️⁉️

Explanation:

Answer 2

Answer:

option C and option D are correct

Explanation:

kinetic energy if directly proportional to velocity

so as velocity decreases the KE also decreases.

as the spring comes back to its initial position, the displacement is zero, so the work done by the formula

W=FxS also becomes zero.