WAEC - Physics (2012 - No. 17)
A body is pulled through a distance of 500m by a force of 20N. If the power developed is 0.4kW, calculate the time for which the force acts
250.0s
25.0s
2.5s
0.5s
คำอธิบาย
Force x Distance = Power x Time
Time = \(\frac{Force \times Distance}{Power}\)
= \(\frac{20 \times 500}{0.4 \times 1000}\)
= 25.0s