JAMB - Physics (1983 - No. 15)
A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If acceleration due to gravity is 10ms-2, the power expended is?
100W
200W
250W
400W
500W
解释
Power = \(\frac{\text{force x distance}}{\text{time}}\)
= \(\frac{50 X 10 X 5}{5}\)= 500W
= \(\frac{50 X 10 X 5}{5}\)= 500W