Physics

Problem

A block of mass

2.0\,\text{kg}

is released from rest at the top of a rough incline that makes an angle of

30^{\circ}

with the horizontal. The vertical height of the top point is

2.0\,\text{m}

above the bottom point. If the coefficient of kinetic friction between the block and the incline is

0.20

, find the speed of the block when it reaches the bottom of the incline. a)

6.3\,\text{m}\,\text{s}^{-1}

5.1\,\text{m}\,\text{s}^{-1}

4.9\,\text{m}\,\text{s}^{-1}

5.6\,\text{m}\,\text{s}^{-1}