A gardener pushes a wheelbarrow along a straight path

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

Problem

A gardener pushes a wheelbarrow along a straight path. He applies a force of

50\,\text{N}

for the first

10\,\text{m}

and then

70\,\text{N}

for the next

20\,\text{m}

. The total time taken is

15\,\text{s}

. Find the average power delivered during the whole trip.