A man applying a force $F$ upon a stretched spring is stationary in a compartment moving with constant speed $v$ . If the compartment covers a distance $L$ in some time $t$ , then

The man acting with force F on spring does the work (w)

= F L

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The total work performed by man on the compartment with respect to ground is zero

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The work done by friction acting on man with respect to ground is, (w)

= F L

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The total work done by man with respect to ground is, (w)

= F L

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Solution

The correct options are
A The man acting with force F on spring does the work (w) $= F L$
B The total work performed by man on the compartment with respect to ground is zero
D The work done by friction acting on man with respect to ground is, (w) $= F L$
The man acting with force F on spring does the work (W) $=$ FL
Also since car moves with constant velocity,
The acceleration of the man would be zero
therefore force acting on man = zero and thus total work done = 0,
Now,
Only a single force F due to man acts producing work done = FL
and thus,
work done by friction acting on man W $=$ FL in opposite direction.

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A man applying a force F upon a stretched spring is stationary in a compartment moving with constant speed v. If the compartment covers a distance L in some time t, then

A man applying a force $F$ upon a stretched spring is stationary in a compartment moving with constant speed $v$ . If the compartment covers a distance $L$ in some time $t$ , then