Question

a body is at rest and has a mass of 4 kg. a 20n force is applied on it for 4 seconds till the velocity becomes 200 m/s
find
i) initial momentum
ii) final momentum
iii) acceleration
iv)force applied​

Answer 1

Answer:

a body is at rest and has a mass of 4 kg. a 20n force is applied on it for 4 seconds till the velocity becomes 200 m/s

find

Explanation:

ii) final momentum

Answer 2

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=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

THANKS....