A ball of mass 0.1 kg is thrown against a wall... It strikes the wall normally with a velocity of 30 m/s and rebounds with a velocity of 20 m/s. Calculate the change in momentum of the ball...
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Solution
The change in momentum is final momentum-initial momentum. if the direction of initial velocity as positive, then the final velocity is negetive.
initial monentum=m×v =0.1×30=3 final momentum= 0.1×-20=-2 change in momentum= final momentum- initial momentum =3-(-2)=3+2=5 kgm/s.