Question

State Newton’s second law of motion? A force of 20 N acts on a body of mass 4kg
for 6s, initially at rest. Calculate the velocity acquired by the body.

Answer 1

Answer:

Impulse on the body would be J−FΔt, where F=20N,t=3s also impulse is change in momentum :J=MΔV

so,

m(v−u)=Ft,m−4kg,u=0m/s gives,

4V=20×3→V=15m/s

Please flw me

Answer 2

Newton's Second Law of motion states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force. ie., F=ma. Where F is the force applied, m is the mass of the body, and a, the acceleration produced.

F = ma
20 = 4 * (v-0)/6
30 = v-0
v = 30 m/s