Problem

1. (a) Define the term *linear momentum*. 2. (b) Show that the units for momentum,

\text{kgms}^{-1}

, can also be written as

\text{Ns}

. 3. (c) Calculate the momentum of (i) a girl of mass 50 kg running westwards at a speed of

6 \text{ ms}^{-1}

. (ii) an electron of mass

9.1 \times 10^{-31} \text{ kg}

travelling at a speed of

2.0 \times 10^{7} \text{ ms}^{-1}

towards an anode. (iii) a hockey ball of mass 110 g travelling at

60 \text{ ms}^{-1}

towards a goal.