Question

A particle is moving with the speed of6m/s and stops after 3sec. Find the force exerted on particle to stop if the mass of particle is 20gm

Answer 1

Answer:

Explanation: acceleration = change in velocity /Time= 0-6/3 =2m/s^2

Force = mass × acceleration= 20×-2= -40N

Answer 2

Answer:-  -40 N

Explanation: as we know that f=ma

we can write it as f=m(v-u/t)

so initially u=6m/s

and finally v=0

and t=3 sec

so, putting these values in that formula we get  

answer as 400 newton