Question

A lady pulls a bucket filled with water having mass 10 kg, from on 8m deep well in 20 s. Calculate work done and power.

GSEB - Class 9 Chapter - 1. Work, Energy and Power Page 11

Answer 1

force applied by lady to overcome gravitational force =10*9.8=98N
s= 8
w= f*s= 98*8=784J
power = w/time
= 784/20=39.2. J/s or w

Answer 2

Answer:

m=10kg

h=8m

t=20s

g=m=10m/s

p=mgh÷t

=10×10×8÷20

=40W

POWER=40W