During compression of a spring the work done is 10 kJ and 2 kJ escaped to the surroundings as heat. The change in internal energy, `Delta U` (in kJ) is _________ .

Options

A. 8
B. `-12`
C. 12
D. `-8`

Answer

A

Explanation

`q =-2 kJ`
`w = + 10 kJ`
`DeltaU = q + w = -2 + 10 = + 8 kJ`