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
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
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 Kinetic Energy questions
A particle of mass m at rest is acted upon by a force P for time t. Its kinetic energy is:
A disc at rest without slipping, rolls down a hill of height (3 x 9.8) m. What is its speed in m/sec when it reaches the bottom?
If momentum is increased by 20% then K.E. increases by _.
A force of 6 N acts horizontally on a stationary mass of 2 kg for 4 s. The kinetic energy in Joule is:
If the momentum of a body decreases by 20% the percentage decrease in K.E will be:
A 6.0-kg block is released from the rest 80m above the ground. When it has fallen 60m its kinetic energy is approximately: