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Standard XII

Physics

General Gravity Problem

A small ball ...

Question

A small ball falling vertically downward with constant velocity $2 m / s$ strikes elastically an inclined plane moving with velocity $2 m / s$ as shown in figure. The velocity of rebound of the ball with respect to ground is :

4 m / s

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2 \sqrt{5} m / s

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2 \sqrt{2} m / s

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2 m / s

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Solution

The correct option is B $2 \sqrt{5} m / s$
The velocity of rebound of the ball with respect to ground is given as,

$v_{b} = 2 v^i + v^j$

$| v_{b} | = \sqrt{{(2 \times 2)}^{2} + {(2)}^{2}}$

$| v_{b} | = 2 \sqrt{5} m / s$

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A small ball falling vertically downward with constant velocity 2m/s strikes elastically an inclined plane moving with velocity 2m/s as shown in figure. The velocity of rebound of the ball with respect to ground is :

The correct option is B 2√5m/sThe velocity of rebound of the ball with respect to ground is given as, vb=2v^i+v^j |vb|=√(2×2)2+(2)2 |vb|=2√5m/s

A small ball falling vertically downward with constant velocity $2 m / s$ strikes elastically an inclined plane moving with velocity $2 m / s$ as shown in figure. The velocity of rebound of the ball with respect to ground is :

The correct option is B $2 \sqrt{5} m / s$
The velocity of rebound of the ball with respect to ground is given as,

$v_{b} = 2 v^i + v^j$

$| v_{b} | = \sqrt{{(2 \times 2)}^{2} + {(2)}^{2}}$

$| v_{b} | = 2 \sqrt{5} m / s$