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
Correct Answer: Option E
Explanation
Power = (frac{text{force x distance}}{text{time}})
= 50 x 10 x 5 = 500W