Physics

Problem

3.0\,\text{kg}

block is pulled up a

5.0\,\text{m}

long incline that makes a

30^{\circ}

angle with the horizontal. Starting from rest, the block reaches the top in

4.0\,\text{s}

with a speed of

2.0\,\text{m}\!/\!\text{s}

. The coefficient of kinetic friction between the block and the incline is

0.10

. Calculate the average power supplied by the pulling force during the ascent.