Maharashtra State PSC Model Paper 1

Question : 73 of 100

Marks: +1, -0

If the kinetic energy of the body of fixed mass is constant then which of the following statement is correct:
a) Its velocity must be constant
b) Its speed must be constant
c) Its acceleration must be zero

Only a is correct
Only b is correct
Only c is correct
All are correct

Validate

Solution:

CONCEPT:

Kinetic energy

The energy possessed by a body due to the virtue of its motion is called kinetic energy.

⇒ {KE}=\;{1}/{2} {mv}^{2}

Where KE = kinetic energy, m = mass and v = speed

EXPLANATION:

The kinetic energy of the body of mass m and the speed v is given as,

⇒ {KE}=\;{1}/{2} {mv}^{2}

If the direction of the body changes its direction without changing the speed, its velocity will change because velocity is a vector quantity, and since the velocity changes so the acceleration will not be zero.
Hence option 2 is correct.

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