A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved ?
Momentum and kinetic energy
Kinetic energy alone
Momentum alone
Neither momentum nor kinetic energy
The collision is perfectly inelastic. Hence only linear momentum is conserved and Kinetic energy is not.
A bag (mass M) hangs by a long thread and a bullet (mass m) comes horizontally with velocity v and gets caught in the bag. Then for the combined (bag + bullet) system