Question

A GIRL OF WEIGHT 440 NEWTON CLIMBS UP A ROPE THROUGH A HEIGHT OF 7 METER IN 20 SECOND. THE POWER EXPENDED BY THE GIRL IS

Answer 1

440×7/20............

Answer 2

Hey dear,

● Answer -
P = 154 J/s

● Explaination -
# Given -
mg = 440 N
h = 7 m
t = 20 s

# Solution -
Power expended by the girl -
P = W/t
P = mgh/t
P = 440 × 7 / 20
P = 154 J/s

Therefore, power expended by the girl is 154 J/s.

Hope this helps you...