# A child of mass 4 kg jumps from cart  to cart  and then immediately back to cart . The mass of each cart is 20 kg and they are initially at rest. In both the cases the child jumps at 6 m/s relative to the cart. If the cart moves along the same line with negligible friction with the final velocities of and , respectively, find the ratio of   and

## Question ID - 101412 | SaraNextGen Top Answer A child of mass 4 kg jumps from cart  to cart  and then immediately back to cart . The mass of each cart is 20 kg and they are initially at rest. In both the cases the child jumps at 6 m/s relative to the cart. If the cart moves along the same line with negligible friction with the final velocities of and , respectively, find the ratio of   and

1 Answer
127 votes
Answer Key / Explanation : (1) -

(1)

All the velocities shown in diagrams are w.r.t. ground

After first jump:

and (given)

Solve to get

When child arrives on :

After the second jump:

Solve to get

When child arrives on :

Now

127 votes

127