NDA 2022 Physics question

A boy of mass 52 kg jumps with a horizontal velocity of 2 m/s onto a stationary cart of mass 3 kg. The cart is fixed with frictionless wheels. Which one of the following would be the speed of the cart?

(A)2·15 m/s
(B)1·89 m/sCorrect
(C)1·51 m/s
(D)2·51 m/s

Answer: (B)

Solution

The wheels are frictionless, so horizontal momentum is conserved. Before: (the cart is at rest). After, boy and cart move

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Question ID VK-032072