Question

A man wearing a bullet proof vest stands on a roller skates. The total mass is 80kg. A bullet of mass 20g is fired at 400m/s. It is stopped by the vest and falls to the ground. What is the velocity of the man then?

Select one:

A. 0.1m/s

B. 0.01m/s

C. 1m/s

D. 100m/s
help!​

Answer 1

Answer:

A = 0.1m/s is the answer...

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Explanation:

Given:

Mass of the man,m1​=80kg

Speed of man after collision, v1​

Mass of bullet m2​=20g=0.02kg

Speed of bullet v2​=400m/s

According to law of conservation of momentum

m1​v1​=m2​v2​

80×v1​=0.02×400

v1​=80400×0.02​=0.1m/s

Answer 2

Answer:

0.1 m/s

Explanation: