Question

A body of 5 kg mass placed on a smooth
horizontal surface experiences a force varying
with displacement of body as shown in figure.
The Kinetic energy of body when force ceases
to act on it is​

Answer 1

Answer:

4000J

Explanation:

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=  

m

F

​  

=  

5

20

​  

=4m/s  

2

 

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

​  

=  

2

1

​  

mv  

2

=  

2

1

​  

(5)×(40)  

2

=4000J

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