Question

A constant force of 30 N acts on a body initially at rest for 4 sec and then seizes to act.It then moves 48m in the next 8 sec .What is the mass of the body

Answer 1

F=30N u=0,t=4 sec s=48m

Answer 2

Force=30N Acceleration=(8-0)÷(4+8)=2/3
We know force =mass ×acceleration
30 =m×2/3
m =45
Mass is 45 kg