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Standard XII

Physics

Final Velocities

A heavy steel...

Question

A heavy steel ball of mass greater than 1 kg moving with a speed of 2 $m s e c^{- 1}$ collides head on with a stationary ping-pong ball of mass less than 0.1 gm. The collision is elastic. After the collision the ping-pong ball moves approximately with speed of.

2 m/s

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4 m/s

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2 \times 10^{4}

m/s

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2 \times 10^{3}

m/s

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Solution

The correct option is B 4 m/s
We know that when heavier body strikes elastically with a lighter body then after collision lighter body will move with double velocity than that of the heavier body.
i.e,
the ping pong ball will move with a speed of $2 \times 2 = 4 m / s$

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A heavy steel ball of mass greater than 1 kg moving with a speed of 2 m sec−1collides head on with a stationary ping-pong ball of mass less than 0.1 gm. The collision is elastic. After the collision the ping-pong ball moves approximately with speed of.

The correct option is B 4 m/sWe know that when heavier body strikes elastically with a lighter body then after collision lighter body will move with double velocity than that of the heavier body. i.e, the ping pong ball will move with a speed of 2×2=4m/s

A heavy steel ball of mass greater than 1 kg moving with a speed of 2 $m s e c^{- 1}$ collides head on with a stationary ping-pong ball of mass less than 0.1 gm. The collision is elastic. After the collision the ping-pong ball moves approximately with speed of.

The correct option is B 4 m/s
We know that when heavier body strikes elastically with a lighter body then after collision lighter body will move with double velocity than that of the heavier body.
i.e,
the ping pong ball will move with a speed of $2 \times 2 = 4 m / s$