A 0.5 kg ball moving at 6 m/s has kinetic energy
Correct answer: A. 9 J
- A. 9 J
- B. 18 J
- C. 6 J
- D. 3 J
Explanation
Kinetic energy is half mv squared, so half multiplied by 0.5 multiplied by 36 gives 9 J. Forgetting the factor of one half gives 18 J, which is the commonest slip. Note that the momentum of the same ball would be 3 kg m per second, which is why 3 also appears as a distractor.
This question appeared on the UHS MDCAT 2025 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? support@testustad.com
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
If P is the momentum of an object and m is its mass, then its kinetic energy is:
A body of mass 1 kg has kinetic energy 50 J. Its speed is
If the speed of a car is doubled, its kinetic energy becomes
If the momentum of an object is increased twice, then what will be the kinetic energy?
A hoop and disc have same mass and radius. Their rotational K.E are related by an equation______________?
When the speed of a moving body is doubled then___________________?