A block of mass m moving with a velocity v_0 | vedclass

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(D) Observer $B$ is in a non-inertial frame (the block). In this frame,the block is at rest,but the wall and the spring are moving towards the block w

Vedclass · Accepted Answer

all the above

Vedclass · Answer

(D) Observer $B$ is in a non-inertial frame (the block). In this frame,the block is at rest,but the wall and the spring are moving towards the block with velocity $v_0$. As the spring compresses,the wall exerts a force on the spring. In the frame of the block,the wall moves towards the block,and the force exerted by the wall on the spring is in the direction of the wall's displacement. Thus,the work done by the wall on the spring is positive. Additionally,a pseudo force acts on the block in the direction opposite to its acceleration. Since the block is decelerating,the pseudo force acts in the direction of motion,doing positive work. Finally,in this frame,the kinetic energy of the block is zero throughout,but the work-energy theorem in a non-inertial frame involves pseudo forces. Since all the mentioned factors contribute to the energy change in the non-inertial frame of reference,the correct answer is all the above.

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