A man applying a force \( F \) upon a stretched spring is stationary in a compartment moving wit...

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A man applying a force \( F \) upon a stretched spring is stationary in a compartment moving with constant speed \( v \). The compartment covers a distance \( L \) in some time \( t \).
(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 + spring) with respect to ground is zero.
(c) The work done by friction acting on man with respect to ground is, \( w=-F L \).
(d) The total work done by man with respect to ground is, \( w=-F L \).
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