KVPY2013PhysicsCenter of Mass, Momentum and Collision
A bullet of mass m is fired horizontally into a large sphere of mass M and radius R resting on a smooth horizontal table. The bullet hits the sphere at a height h from the table and sticks to its surface. If the sphere starts rolling without slippng immediately on impact, then
Options
- Ah R = 4 ~m +3 M 2( ~m + M )
- Bh R = m +3 M m +2 M
- Ch R = 10 ~m +7 M 5( ~m + M )
- Dh R = 4 m+3 M m+M
Correct answer
C. h R = 10 ~m +7 M 5( ~m + M )
Step-by-step solution
Apply conservation of linear momentum array l m v=(m+M) v₀ m v R= ( 2 5 M R²+m R² ) ₀ m v ( h-R R ) R= (2 M+5 M) 5 ₀ R² (m+M)(h-R) ₀ R= (2 M+5 M) 5 ₀ R² h R = (10 m+7 M) 5(m+M) array