Physics

Problem

In a certain motion, the work done on a body increases linearly from

0

150\,\text{J}

during the first

3\,\text{s}

and then linearly to

450\,\text{J}

t=12\,\text{s}

. What is the instantaneous power just after

t=3\,\text{s}

? a)

37.5\,\text{W}

33\,\text{W}

50\,\text{W}

42\,\text{W}