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Standard XII

Physics

Newton's Second Law

In the system...

Question

In the system shown, find the speed with which $12 k g$ block weight hit the ground.

2 \sqrt{10} m s^{- 1}

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4 \sqrt{2} m s^{- 1}

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2 \sqrt{5} m s^{- 1}

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3 m s^{- 1}

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Solution

The correct option is B $2 \sqrt{5} m s^{- 1}$
$m_{2} g h - m_{1} g h = \frac{1}{2} m_{1} v_{1}^{2} + \frac{1}{2} m_{2} v_{2}^{2}$
or $8 \times 10 \times 2 = \frac{1}{2} \times 16 v^{2}$
$v = 2 \sqrt{5} m s^{- 1}$

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In the system shown, find the speed with which 12kg block weight hit the ground.

The correct option is B 2√5ms−1m2gh−m1gh=12m1v21+12m2v22or 8×10×2=12×16v2v=2√5ms−1

In the system shown, find the speed with which $12 k g$ block weight hit the ground.

The correct option is B $2 \sqrt{5} m s^{- 1}$
$m_{2} g h - m_{1} g h = \frac{1}{2} m_{1} v_{1}^{2} + \frac{1}{2} m_{2} v_{2}^{2}$
or $8 \times 10 \times 2 = \frac{1}{2} \times 16 v^{2}$
$v = 2 \sqrt{5} m s^{- 1}$