Question

on tripling the speed of motion of a body the change in kinetic energy is​

Answer 1

Explanation:

on tripling the speed of motion of a body the kinetic energy will be 9 times

Answer 2

New kinetic energy will be 9 times of previous kinetic energy

Explanation:

Let the mass of the body is m and speed is v

So kinetic energy of the body will be equal to $\frac{1}{2}mv^2$

Now mass of the body is same but speed of the body is tripped

So new velocity $v_{new}=3v$

So new kinetic energy $KE_{new}=\frac{1}{2}m(3v)^2=\frac{9}{2}mv^2=9\times \frac{1}{2}mv^2$

So new kinetic energy will be 9 times of previous kinetic energy  

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