Question

In an elastic collision in the absence of external forces, which of the following is correct?

• A. The linear momentum changes in collision
• B. The final kinetic energy is less than the initial kinetic energy
• C. The linear momentum is conserved
• D. The final kinetic energy is more than the initial kinetic energy

Answer 1

The correct option is C The linear momentum is conserved

As we know, if there is no external force present linear momentum will be conserved.
Also, in an elastic coliision
Velocity of seperation = Velocity of approach
So, there is no loss of speed of the system during the collision (elastic). Hence, the kinetic energy will be same before and after the collision.
Option (c) is correct.