A gardener pushes a lawn roller along level ground and then up a gentle slope.

PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A gardener pushes a lawn roller along level ground and then up a gentle slope. (i) While on level ground he delivers power at a constant rate of

220\,\text{W}

for

2\,\text{min}

. Calculate the work done in this stage. (ii) On the slope he continues for another

3\,\text{min}

but now delivers only

180\,\text{W}

of power. Calculate the work done on the slope. (iii) Find the total work done by the gardener on the roller for the entire

5\,\text{min}

trip. (iv) Determine the average power over the whole journey.