A particle of mass $m$ moving with a velocity $\vec V$ makes a head on elastic collision with another particle of same mass initially at rest. The velocity of the first particle after the collision will be
A particle of mass $m$ moving with a velocity $\vec V$ makes a head on elastic collision with another particle of same mass initially at rest. The velocity of the first particle after the collision will be
$\vec V$
$ - \vec V$
$ - 2\vec V$
Zero
A particle of mass $m$ moving with a velocity $\vec V$ makes a head on elastic collision with another particle of same mass initially at rest. The velocity of the first particle after the collision will be
In perfectly elastic head on collision of equal masses velocities gets interchanged
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