Question

When two bodies collide elastically then the quantity conserved is:
A. Kinetic energy
B. Momentum
C. Both
D. None

Answer 1

Hint: Collision is in which there is no loss of kinetic energy in the system, and a result of the collision is called elastic collision. Collision means in which any two bodies or objects extract each other is called collision. Collision might occur in any two bodies or objects in that state the masses might change.

Complete step-by-step solution:
When two objects collide each other, the quantity conserved is kinetic energy and momentum.
For example, when two trolley’s travel towards each other with the same speed, when they collide with each other then their bounce will not lose their speed. This type of collision is called perfectly elastic because there is no loss in the energy.
When two bodies collide with each other, then one body loses its momentum and another body gains its momentum, this type of collision is called elastic collision. In this type of collision both kinetic energy and momentum are conserved.
When two bodies collides each other and not bounce each other than in this type of collision, there is no kinetic energy and only momentum is conserved this type of collision is called inelastic collision.
Momentum is conserved when two collide bodies remain the same after the collision. Kinetic energy when the collision is inelastic where the objects stick together.

Note: If two bodies collide elastically then there is both kinetic energy and momentum forms. Thus from the given options the correct option is c both momentum and kinetic energy. Elastic collisions preserve both the quantities kinetic energy and momentum is conserved.