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  • A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car

 A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
(a) does not change
(b) becomes twice to that of initial
(c) becomes 4 times that of initial
(d) becomes 16 times that of initial

Answers (1)

Answer:   [A]
 

Solution.

The kinetic energy of a body increases on increasing speed.
KE=\frac{1}{2}mv^{2}
The potential energy of the body increases by increasing height from the surface of earth.
PE=mgh
In the given question, the car is increasing speed on the level road. Hence, its kinetic energy must be increasing.
The kinetic energy will be 16 times of the initial kinetic energy as velocity becomes four times.
The car's height from the ground is not changing as it is moving on a level road. 
Therefore, we can say that the potential energy of the car is not changing.
Hence, the correct answer to this question is option A.

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infoexpert26

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