Question

Which of the following statement is correct regarding perfectly inelastic collision?
1. Objects stick together after the collision
2. Some kinetic energy is lost
3. Both 1 and 2
4. Neither 1 nor 2

Answer 1

Correct Answer - Option 3 : Both 1 and 2

Concept:

• Collision: An event in which two or more bodies exert forces on each other for a very short time is called a collision.
  • It results in the exchange or transformation of energy.
• Inelastic Collision: A collision that takes place between two objects in which some energy is lost.
• In the case of inelastic collision, the kinetic energy is not conserved but momentum is conserved.

• During a perfectly inelastic collision objects stick together.

Explanation:

Option 1: During a perfectly inelastic collision objects, after the collision, stick together and move with the same velocity. So this is the correct answer.

Option 2: In an inelastic collision some energy is lost in the form of vibration, friction, etc. So this is also the correct answer.

So the correct answer is option 3 i.e. Both 1 and 2.​

Characteristic of elastic and inelastic collision:

Elastic collision	Inelastic collision
The kinetic energy is conserved.	The kinetic energy is not conserved.
The momentum is conserved.	The momentum is conserved.
The total energy is conserved.	The total energy is conserved.
Forces involved during a collision are conservative.	Some or all of the forces involved during a collision are non-conservative.