During compression of a spring the work done is 10 \( \mathrm{kJ} \) and \( 2 \mathrm{~kJ} \) es....

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During compression of a spring the work done is 10 \( \mathrm{kJ} \) and \( 2 \mathrm{~kJ} \) escaped to the surroundings as heat. The
P
change in internal energy, \( \Delta \mathrm{U} \) (in \( \mathrm{kJ} \) ) is:
(1) 8
(2) -8
(3) 12
(4) -12


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