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Q.

Two identical balls, one moves with $6 m / s$ and second is at rest, collides elastically. After collision velocity of second and first ball will be

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a

$6 \frac{m}{s,} 6 \frac{m}{s}$

b

$12 \frac{m}{s}, 12 \frac{m}{s}$

c

$6 \frac{m}{s}, 0 \frac{m}{s}$

d

$0 \frac{m}{s}, 6 \frac{m}{s}$

answer is C.

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Detailed Solution

Velocity get inter changed

$u_{1} = 6 \frac{m}{s}; u_{2} = 0 ∴ v_{1} = 0; v_{2} = 6 \frac{m}{s}$

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Two identical balls, one moves with 6 m/s and second is at rest, collides elastically. After collision velocity of second and first ball will be