A machine pulls a crate on a horizontal floor with a constant force

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A machine pulls a crate on a horizontal floor with a constant force. The speed of the crate increases uniformly from

2\,\text{m/s}

6\,\text{m/s}

20\,\text{s}

while

6000\,\text{J}

of work is done. What is the magnitude of the pulling force? (a)

150\,\text{N}

(b)

300\,\text{N}

(c)

75\,\text{N}

(d)

50\,\text{N}