Question

A force 20N acts on a mass 5kg for 10s .find the velocity after 10s if the mass was initially at rest​

Answer 1

Answer:

Question

A body of mass 5 kg, initially at rest, is subjected to a force of 20N. What is the kinetic energy acquired by the body at the end of 10 s ?

A

2000J

B

4000J

C

8000J

D

1000J

Medium

Explanation:

Solution

Correct option is

B

4000J

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=mF=520=4m/s2

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,

Ek=21mv2=21(5)×(40)2=4000J

Answer 2

Answer:

v = 40 m/s.

Explanation:

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