What would be the kinetic energy of car in this process? - ProProfs Discuss

What would be the kinetic energy of car in this process? A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity.

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A. Becomes twice to that of the initial
B. Becomes four times to that of the initial
C. Remains the same
D. Becomes 16 times to that of the initial

This question is part of Work And Energy
Asked by Jagran josh, Last updated: Nov 24, 2018

C. Snow

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C. SnowMotivator, MA, California
Motivator, MA, California

The correct answer to this question is D, Becomes 16 times to that of the initial. To find kinetic energy, we would use the equation K = ½mu2. The initial velocity is u and based off the question, and the final speed becomes v = 4u. Knowing this information, we can fill in the equation, making it K' = ½m(4u)2 and solving that gives us 16, which is the answer. If the question were asking about potential energy, the correct answer would be C. Remains the same. This is because that type of power doesn't change and will be the same regardless of the velocity.

John Smith

John Smith

Becomes 16 times to that of the initial

Pls tell me how?

Replied on Sep 20, 2017

How it is possible