15. Exercises

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Exercise 15.1

Calculate the momentum of

a) a train, of mass 120 tonnes, travelling at 40 \displaystyle \text{m}{{\text{s}}^{-1}},

b) a table tennis ball, of mass 3 grams, travelling at 4 \displaystyle \text{m}{{\text{s}}^{-1}},

c) a car, of mass 1200 kg, travelling at 36 kmph.



Exercise 15.2

A ball, of mass 100 grams, is travelling horizontally at 8 \displaystyle \text{m}{{\text{s}}^{-1}} when it hits a wall and rebounds at 5 \displaystyle \text{m}{{\text{s}}^{-1}}. Assume that all the motion is perpendicular to the wall. Calculate the magnitude of the impulse on the ball.