Question

2) A body of mass 5kg initaly
rest is subject to a force
20n, what is the kinetic energy
aquired by the body of
end of 10 seconds.
​

Answer 1

m = 5kg

u = 0m/s

F = 20N

T = 10s

We know, force*time = change in momentum

=> 20*10 = 5(v-0)

200 = 5v

v = 40m/s

Kinetic energy = 1/2*m*v²

1/2 * 5 * 40²

4000J.

Hope that answers your question!