Physics

Problem

A block starts from rest at the top of a

5\,\text{m}

high rough incline that makes an angle of

30^{\circ}

with the horizontal. The coefficient of kinetic friction between the block and the plane is

0.20

. Neglecting air resistance and taking

g = 9.8\,\text{m}\,\text{s}^{-2}

, the speed of the block when it reaches the bottom of the incline is approximately a)

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

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

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

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