A 10 gram bullet is fired into a 3.0 kilogram block giving theblock a velocity o

Question

A 10 gram bullet is fired into a 3.0 kilogram block giving theblock a velocity of 30 cm/sec. With what velocity was the bulletfired? I know the answer should be 90m/sec but I am having troublegetting it. I tried v2 = m1 x v1/m2 but no such luck. Is it inconversions? A 10 gram bullet is fired into a 3.0 kilogram block giving theblock a velocity of 30 cm/sec. With what velocity was the bulletfired? I know the answer should be 90m/sec but I am having troublegetting it. I tried v2 = m1 x v1/m2 but no such luck. Is it inconversions?

Explanation / Answer

Given : Mass ( m1 )= 10 g = 10 * 10-3 kg ( m2 ) = 3 kg    velocity ( v2 ) = 30 * 10-2 m/s    v1 = ? As we know that m1 v1 = m2 v2       v1 = m2 v2 / m1            =( 3 kg ) * (30 * 10-2 m/s) / (10 * 10-3kg)           = 90m/sec

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