A body of mass 2kg starts from rest and moves with uniform acceleration. It acquires a velocity 20m/s in 4s. The average power exerted on the body in 2s is
1)50W
2)100W
3)150W
4)200W
Answers
Answered by
3
200W is the answer
hope it's correct
hope it's correct
Answered by
1
m=2 kg
u= o m/s
v= 20 m/s
t= 4 s
so, acceleration = (v-u)/t
= 20/4
= 5 m/s^2
therefore, force= 2×5=10 N
s= 1/2 at^2
= 1/2×5×16
= 40 m
so, work = force×displacement
= 10×40
= 400 j
therefore, power = work /time
= 400/2
= 200 watt
u= o m/s
v= 20 m/s
t= 4 s
so, acceleration = (v-u)/t
= 20/4
= 5 m/s^2
therefore, force= 2×5=10 N
s= 1/2 at^2
= 1/2×5×16
= 40 m
so, work = force×displacement
= 10×40
= 400 j
therefore, power = work /time
= 400/2
= 200 watt
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