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2 April, 16:47

A kid at the junior high cafeteria wants to propel an empty milk carton along a lunch table by hitting it with a 3.0g spit ball.

If he wants the speed of the 40g carton just after the spit ball hits it to be 0.30 m/s, at what speed should his 3.0 g spit ball hit the carton?

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  1. 2 April, 18:19
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    4.3 m/s

    Explanation:

    Using conservation of momentum, assume that the collision is elastic and that the 3.0 g ball stuck with the carton

    3.0 g = 3 / 1000 = 0.003 kg = m₁

    40 g = 40 / 1000 = 0.04 kg = m₂, u₂ = 0 since the body is stationary and v = 0.3m/s

    m₁u₁ + m₂u₂ = v (m₁ + m₂)

    0.003 u₁ = 0.30 (0.003 + 0.04) = 0.0129

    u₁ = 0.0129 / 0.003 = 4.3 m/s
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