When momentum of the body increased by 200%, its kinetic energy increases by _.
Correct answer: D. 800%
- A. 200%
- B. 300%
- C. 400%
- D. 800%
Explanation
Kinetic Energy can also be expressed as p2/2m. Hence, KE is directly proportional to the square of momentum. So if momentum was 100% before, and increases by 200%, it now becomes 300%. Therefore Kinetic Energy will become (300%)2 which is equal to 900%. So if KE was 100% before, and now becomes 900%, it must have increased by 800%. Hence, Option D is correct.
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
750 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
What is kinetic energy of body 5kg and momentum 15 kgm/sec?
If mass and speed both are doubled kinetic energy wil
If momentum is increased by 20% then K.E. increase by :
If momentum is increased by 20% then K.E. increases by _.
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?
A particle of mass m at rest is acted upon by a force P for time t. Its kinetic energy is: