Two particles of masses m and 4m have linear momenta in the ratio of 2:1. What is the ratio of their kinetic energies?
Correct answer: D. 16
- A. √2
- B. 2
- C. 4
- D. 16
Explanation
Formula:KE1/KE2= p1/p2²m2/m1 Calculation:KE1/KE2 =( 2/1)^2 ×{4/1} = 4 ×4 = 16 The ratio of kinetic energies is 16:1.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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 Work and Energy questions
A force applied by an engine of a train of mass 2.05 x 10^6 kg changes its velocity from 5m/s to 25m/s in 5 minutes. The power of the engine is:
How much work must be done by a force on 50 kg body in order to accelerate it from rest to 20 m/s in 10 s?
1 MWh is equal to:
A particle of mass m at rest is acted upon by a force F for a time t. Its K.E after an interval t is
When the velocity of the body is doubled and the mass is halved the K.E will be:
A mass of 10g moving with velocity of 100 cm/s strikes a pendulum bob of mass 10g. The two masses stick together. The maximum height reached by the system now is (g = 10 m/s2):