Question

if a body of mass 5 kg is moving along a straight line with velocity 10 ms and acceleration 20 ms. find its kinetic energy after 10 sec
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Answer 1

Answer: Given, mass of the body, m=5kg;

Initial velocity of the body, u=0;

Force acting on the body, F=20N;

Time for which the force acts, t=10s

If a is the acceleration produced in the body,

a=f/m = 4m /square

Let v be the velocity of the body after 10 s.

Clearly, v=u+at=0+(4)×(10)=40m/s

Kinetic energy acquired by the body,

E k = 1/2mv square = 1/2(5) * (40)2  

= 4000 J

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