A 075-Kg Block Slides on a Rough Horizontal Table Top

Multiple Choice

A 0.75-kg block slides on a rough horizontal table top.Just before it hits a horizontal ideal spring its speed is 3.5 m/s.It compresses the spring 5.7 cm before coming to rest.If the spring constant is 1200 N/m, the thermal energy of the block and the table top must have:

A) not changed
B) decreased by 1.9 J
C) decreased by 2.6 J
D) increased by 1.9 J
E) increased by 2.6 J