Two similar spheres, each of mass m and travelling with speed v, are moving towards each other.The spheres have a head-on elastic collision. Which statement is correct?
Correct answer: C. The total kinetic energy after impact is mv2
- A. The spheres stick together on impact
- B. The total kinetic energy before impact is zero
- C. The total kinetic energy after impact is mv2
- D. The total momentum before impact is 2mv
Explanation
Kinetic energy is conversed for elastic collision. As the mass and velocity of the spheres is same their kinetic energy would also be same i.e 1/2 mv2. Therefore, when we add both of their kinetic energies we get mv2.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Force and Motion questions
The graph shows how the force on a body varies with time. Assuming that the body is moving in a straight line, by how much does its momentum change?
A force of 100 Dynes acts on mass of 5kg for 10sec. The velocity produced is_
A force of 6N acts on a mass of 1kg which acquire velocity of 30ms-1, The times for which the force acts is
Time taken by a projectile to reach maximum height is:
Two projectiles are projected at angle of 200 and 700 with same velocity which one have longer range?
A projectile is launched at point O and follows the path OPQRS, as shown, Air resistance may be neglected. Which statement is true for the projectile when it is at the highest point Q of its path?