Question

If an object of mass 'm' moving with velocity 'v' acted by external force suspect that its velocity increased by 4 times. Find the percentage of change in momentum.​

Answer 1

Answer:

Initial momentum of system , p

1

=mv

Let V be the velocity of composite system

Final momentum os system , p

2

=(m+M)V

By conservation of momentum,

mv=(m+M)V

∴V=

m+M

mv

Kinetic energy of composite block, K=

2

1

(M+m)V

2

=

2

1

(M+m)(

m+M

mv

) 2 = 2

1 mv2 ×m+Mm