WAEC - Physics (2011 - No. 20)
A body is pulled over a distance of 500m by a force of 20N. If the power developed is o.4 kW, calculate the time interval during which the force is applied
0.2s
2.5s
25.0s
250.0s
Објашњење
t = \(\frac{fs}{p} = \frac{20 \times 500}{0.4 \times 1000} = 25s\)