20 gram of body is is moving with a velocity of 40 kilometre per hour brakes are applied after 10 seconds it attains with a velocity of 20 kilometre per hour calculate the work done by the body in 20 metre
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Explanation:
Force =mt(v−u)=m⋅a
Displacement =2a(v2−u2)
Word done (W) = Force × Displacement
=m⋅a⋅2a(v2−u2)
W =21m(v2−u2)
W =21×20×(2500−1600)
=21×20×900
=9000J
Therefore, the work done to attain the final velocity is 9000J
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