Momentum And Collisions 5

Question

(a)Calculate the momentum of a 2200 kg elephant charging a hunter at a speed of 7.50 m/s.

 

kg · m/s

 

(b)Compare the elephant's momentum with that of a 0.0400 kg bullet fired at a speed of 600 m/s.

(c)What is the momentum in kilograms times meters per second of the 90.0 kg hunter running at 8.00 m/s after missing the elephant?

kg · m/s

Answer 1

Dominic,

 

In each case you are given the mass m of the body in kg, and the speed v in m/s.  The linear momentum p is just

 

p = mv

 

Its units will be kg m/s.  You do not even have to worry about unit conversions in this problem.  Just evaluate mv in each case, and you will have your answers.