A 40 kg girl runs up a flight of stairs having a rise of 5 m in 4 s. The power developed by her will be ________. (take g = 10 m/s2)
A
:
100 W
B
:
200 W
C
:
500 W
D
:
2000 W
General Science
Physics
Work Power Energy
Answer
Option 3 : 500 W
Explanation
→ Given data -
- Mass, m = 40 kg
Height, h = 5m
Time, t = 4s
- Work done, W = mgh
W = 40 × 10 × 5 [g = 10 m/s2, given]
W = 2000 joules
→ Power, P = work done /time
P = 2000/4
P = 500 joule/sec
P = 500 W