Question

a ball of mass m moving with speed u strikes a surface at angle theta from normal of the surface if it rebound with same speed at same angle in time t find the change in moment of ball​

Answer 1

Answer:

The linear momentum of the ball before collision was p

1

=mv

after collision its direction was got reversed but with same speed so the new momentum will be p

2

=−mv

so the change in momentum will be Δp=p

2

−p

1

=−mv−mv=−2mv

So the force exerted will be F=

time

Δp

=

t

−2mv

whose magnitude

is

t

2mv

so option A is correct.