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?
A
100W
B
200W
C
250W
D
400W
E
500W
Verified Correct Answer: E.
Physical Principles & Numerical Solution
Power = \(\frac{\text{force x distance}}{\text{time}}\)
= \(\frac{50 X 10 X 5}{5}\)= 500W
Source: Myschool Past Questions Archive (Record #28836)