Question

During an “elastic collision”
There is no loss of kinetic energy
The bodies are perfectly elastic
Temporarily some of the kinetic energy is used to deform the bodies
After collision the bodies regain the original shape keeping the total energy constant.
A. only “a” is true
B. a, c, d are true
C. b, c, d are true
D. a, b ,c, d are true

Answer 1

Collisions between any objects are directed by the laws of the momentum and the energy. Here we will use the concept of the laws of momentum and energy. In any isolated system, during the elastic collisions the total momentum and the kinetic energy both are conserved.

Complete step by step answer:
We will justify the statement by taking an example. When we throw the ball, the ball bounces back. This is an example of elastic collision where the kinetic energy of the moving ball and the momentum both are conserved.
During an elastic collision, the bodies are perfectly elastic and therefore the kinetic energy used in causing the deformation is recovered in the reformation stage completely with the complete reformation. As a result of collision, both the momentum and the kinetic energy are conserved. Hence, there is no loss of energy.

Hence from the given multiple choices- the option D is the correct answer.

Note:
For the perfectly elastic collision, there is no loss of kinetic energy.
Example: On the billiard table the two balls collide with one another. Remember a high speed car collision is an inelastic collision. Know the difference between the elastic and inelastic collision.