Question

when speed of moving body is doubled:
1) it's acceleration is doubled
2) it's momentum is doubled
3) it's kinetic energy is doubled
4) it's potential energy is doubled​

Answer 1

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→ When speed of moving body is doubled

Answer → Option 2 is correct.

♦its momentum is doubled

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Let us know how ?

→ Momentum = m ( mass ) × v ( velocity )

So if here, mass is constant , and velocity gets doubled.

Momentum $\prop$ Velocity

Therefore , Momentum gets doubled when velocity gets doubled.

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→ Accleration also gets doubled as it is change in rate of velocity with time.

But marking option 2 is apt.

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Why not the other options ?

•Here is your answer to that also →

♦Kinetic energy becomes four times when speed is doubled.

KE = $\sf \dfrac{1}{2} m {v}^{2}$

Therefore it gets four times.

♦ Potential energy has no direct dependence over speed actually.

PE = mgh

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