In elastic collision, when a massive body collides with light body at conditions m1 >> m2 and v2 = 0 ms-1, then the change in velocity will be written as:
Correct answer: C. v1' ≈ v1 ; v2' ≈ 2v1
- A. v1' ≈ −v1 ; v2' ≈ v1
- B. v1' ≈ v1 ; v2' ≈ 0
- C. v1' ≈ v1 ; v2' ≈ 2v1
- D. v1' ≈ −v1 ; v2' ≈ 0
Explanation
Explanation:V1' = (m1 - 0/m1 + 0) v1 + (2(m2) (0)/0 +m2) V1' = (m1 / m2) v1 + 0V1' = v1 + 0V1' = v1V2' = (2m1v1 / m1) + (0 - m1 / m1 + 0) (0)V2' = 2v1Hence, v1' = v1 and v2' = 2v1
Last updated
About Collisions
Collisions involve the conservation of linear momentum when bodies interact for a short time. The topic covers impulse, elastic and inelastic collisions, kinetic energy changes, and the coefficient of restitution, with calculations usually based on one dimensional motion. Momentum remains conserved in isolated collisions, but kinetic energy is conserved only in elastic collisions.
Practise Force and Motion
1,416 free Force and Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A ball moving horizontally with speed 'v' strikes the bob of a simple pondulum at rest The mass of the bob is equal to that of the ball If the collision is elastic the bob will to a height:
A body is hanging from a rigid support by an extensible string of length L. It is struck inelastically by an identical body of mass m with horizontal velocity v =√2gl , the tension in the string increases just after striking by:
A body of mass 2 kg moving at 3 m per second collides and sticks to a stationary body of mass 4 kg. Their common velocity is
A body of mass 2 kg moving at 3 m s-1 collides and sticks to a stationary body of mass 4 kg. The common velocity after impact is
A body of mass 2kg collides with a wall with speed 100 m s-1 and rebounds with the same speed the force exerted on the wall is 2 x 10^4 N. The time of contactis: