a body of 2kg starts from rest abs moves with uniform acceleration. it acquires a velocity 20m in 4sec. the power exerted on the body in 2sec in watts is
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I hope you help !!!
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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
================
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
sumijohn003:
thank you...
thank you.. it helped me... but in the last step power = work / time = 400/4 =100 but u posted time as 2... Thank you... it helped me a lot....
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