Question

A ball of mass 0.2kg is thrown normally against a wall with a speed of 20ms-'. It rebounds normally
with a speed of 15 ms-l, then impulse by the ball on the wall is

a) 0.35 Ns
b) 0.7 NS
c) 7 Ns
d) 70 Ns​

Answer 1

Answer:

7 N s

Explanation:

We know that, the impulse acting on the body is equal to change in momentum.

       ie, I=dp

           ∴I=Δp

              =mΔv

              =mv-(-mu)

              =mv+mu

              =0.2(15+20)

              =7 N s