Question

A ball of mass 1 kg strikes a wedge of mass 4 kg horizontally with a velocity of 10 m/s. Just after collision, velocity of wedge becomes 4 m/s. Friction is absent everywhere and collision is elastic. Select the correct alternative –

• A. Speed of ball after collision is 12 m/s
• B. Speed of ball after collision is 8 m/s
• C. Impulse between ball and wedge during collision is 16 N-s
• D. Impulse between ball and wedge during collision is 32N-s

Answer 1

Answer: (D)

Impulse between ball and wedge during collision is 32N-s

Answer 2

Apply impulse equation in x-direction

Jcos60⁰ = 4 × 4

[J = 32 N.S]