Question

25
A force of 100 N acts on a mass of 25 kg for 5s. The velocity is -
(A) 15 m/s (B) 20 m/s (0) 25 m/s (D) 12 m/s
(E) 35 m/s

Answer 1

Answer:

Correct option is

C

500 m s

−1

Given : F=100 N m=2 kg t=10 s

Change in momentum of the body m(Δv)=F.t

where Δv is the change in velocity.

⟹ 2×Δv=100×10

⟹ Δv=500 m/s

Answer 2

The forces acting on the object in the opposite directions are equal. The net force will be the difference of the two equal forces. Since both the forces are equal, net force is zero.