The lead female character in the movie Diamonds Are Forever is standing at the e

Question

The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires a gun, she is driven back over the edge and into the sea. Suppose the mass of a bullet is 0.022 kg and its velocity is +710 m/s. Her mass (including the gun) is 55 kg. (a) What recoil velocity does she acquire in response to a single shot from a stationary position, assuming that no external force keeps her in place? (b) Under the same assumption, what would be her recoil velocity if, instead, she shoots a blank cartridge that ejects a mass of 5.0 x 10-4 kg at a velocity of +710 m/s?

Explanation / Answer

by momentum conservation

0.022*710 =55*v

v = 0.284 m/s

when blank cartiredge

5*10^-4 * 710 = 55*v

v = 6.455 *10^-3 m/s

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