Two bodies with masses m1 ans m2 have equal kinetic energies. If M1 and M2 are their respective momentum then the ratio between M1 and M2 is:
Correct answer: B. √m1/m2
- A. m1:m2
- B. √m1/m2
- C. m1²: m2²
- D. √m1:√m2
Explanation
The energy and momentum are related The KE is proportional to square of momentum KE = p²/2m so if two bodies have equal energy then their square of momentum divided by masses will be equal. Say M1 and M2 their momentum M1²/2.m1= M2²/2.m2 So M1/M2 = √m1/m2
Last updated
About Kinetic Energy
Kinetic energy is the energy of motion, given for a nonrelativistic object by K = ½mv², so it depends on mass and the square of speed. Questions connect kinetic energy with work through the work energy theorem, calculate changes in kinetic energy, and distinguish it from momentum and potential energy.
Practise Work and Energy
748 free Work and Energy 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 0.5 kg ball moving at 6 m/s has kinetic energy
A 1 kg ball changes its velocity from 6 m/s to 2 m/s. What are the changes in the kinetic energy of the ball?
A 6.0-kg block is released from the rest 80m above the ground. When it has fallen 60m its kinetic energy is approximately:
A body of mass 1.0 kg drops from the top of a tower of height 50 m. What will be its K.E. 10 m below the top?
A body of mass 1 kg has kinetic energy 50 J. Its speed is