A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s. Her recoil speed is
A) 0.2 mm/s.
B) 2 mm/s.
C) 2 cm/s.
D) 20 cm/s.

Name: A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s. Her recoil speed is A) 0.2 mm/s. B) 2 mm/s. C) 2 cm/s. D) 20 cm/s.
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Question

Quizplus · Accepted Answer

Momentum is conserved, so the recoil speed of the astronaut is:v = (4 g * 50 m/s) / 100 kg = 0.2 mm/s

A 100-Kg Astronaut Ejects 4 G of Gas from Her