If velocity is doubled then__________________?
Correct answer: D. momentum increases 2 times and K.E increases 4 time
- A. momentum increases 4 times and K.E increases 2 times
- B. momentum and K.E. remain same
- C. momentum increases 2 times and K.E increases constant
- D. momentum increases 2 times and K.E increases 4 time
Explanation
Momentum is p = mv, so doubling velocity doubles momentum. Kinetic energy is K.E. = 1/2 mv2, so doubling velocity makes it 2² = 4 times larger. The likely wrong choice is c because it recognises the momentum change but incorrectly treats kinetic energy as directly proportional to velocity.
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
When the speed of a moving body is doubled then___________________?
A hoop and disc have same mass and radius. Their rotational K.E are related by an equation______________?
If the momentum of an object is increased twice, then what will be the kinetic energy?
Proton electron neutron and a particles have same momentum. Which of them have highest K.E ?
A disc, a hoop, and a sphere of the same mass and radius are rolled down from a frictionless, inclined plane. Which has a greater speed on reaching the ground?
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?