Question

the crane lifts a mass of 100kg to a height of 10 m in 20s .the power of the crane is

a) 100 w
b) 200w
c) 250w
d) 500w

Answer 1

answer: d



reason:
here m= 100kg
h= 10m
t= 20s
g= 10m/s square
g= 10 m/ s square
the. Power of crane is
p= mgh/t
100×10×10/20= 10000/20
= 500w


hope it may help u




# be brainly.

Answer 2

power =work done / time
power =mgh/t
m=100kg
g=9.8
h=10m
time =20 s
power =( 100×10×10)÷20
=100×5=500W