Question

A 2.2 kg block starts from rest on a rough inclined plane that makes an angle of 25° with the horizontal.
The coefficient of kinetic friction is 0.25. As the block goes 2.0 m down the plane, the mechanical energy
of the Earth-block system changes by
(1) Zero
(2) -9.8 J
(3) 9.8 J
(4) -18 J
(5) 18 J​

Answer 1

Answer:

Mechnical energy of Earth-block system is always conserved.

So change will be 0.

Thanks.