Physics

Problem

A heavy box of mass

50 \text{ kg}

is moving on a horizontal surface. If co-efficient of kinetic friction between the box and horizontal surface is

0.3

then force of kinetic friction is: (1)

14.7 \text{ N}

(2)

147 \text{ N}

(3)

1.47 \text{ N}

(4)

1470 \text{ N}