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A man shot a ...

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A man shot a bullet with a speed of 10m/ which penetrates a plank of wood. With what speed should he shoot a bullet to just pass through 10 similar planks

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Solution

Energy at 10m/sec = 100m/2 kgm²/s²,
energy reuired to pass through 10 planks is 1000 m/2 kgm²/s².

Mass remaining same,
v = √1000 = 10√10m/s.

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