Question

A girl whose weight is 440N is climb on a pole of hight 7m in 20s. Calculate the power lose by girl.
1. 36w
2. 154w
3. 72w
4. 15.4w

Answer 1

Power= Rate of work/time
.
Work= Force x Displacement
=440 x 7
=3080J

Power= 3080/20
=154W

Ans- 2

Answer 2

Ans. 154w

P = mgh/t

Since mg is given, i.e. Weight,

P = 440*7/20 = 154W.