Question

a marble going at a speed of 5m/s hits another ball of equal mass at rest head on. if the collision is perfectly elastic the velocity of the first after the collision is ​

Answer 1

Velocity of the first after the collision would be 0.

Explanation:

Given,

Marble with a speed of 5 m/s hits the marble at 0

Let the marble be M(5) and M(0),

so,

M(5) + M(0) = $MV_{1}$ + $MV_{2}$ = 0

⇒ $V_{1} + V_{2}$ = 5

⇒   $- \frac{V_{1} + V_{2}}{5 - (0)}$= 1

⇒ $V_{1} - V_{2} = -5$

∵ $V_{1} = 0, V_{2} = 5$

Hence, velocity of the first post collision = 0.

Learn more: Find the velocity

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