Question

how much work is needed to be done on a ball of mass 50 gram to give it a momentum of 500 g cm s^-1. ?

Answer 1

work done by all the forces=change in kinetic energy

W=ΔKE

m=50gm=0.05kg

P=500gcm^-1

we know that or we should know that

KE=P²/2m

ΔKE=W=ΔP²/2m

=500²/2*50

=5000/2

=2500g cm^-1

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