A body of mass has kinetic energy

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A body of mass

3.0\text{ kg}

has kinetic energy

36\text{ J}

. It is brought to rest after travelling a horizontal distance of

4.0\text{ m}

. A frictional force acts in a direction opposite to the velocity. Determine the magnitude of the frictional force.