Question\begin{tabular}{|c|c|} \hline 4 & \begin{tabular}{l} A vehicle of mass 900 kg is travelling with a velocity of $20 \mathrm{~m} / \mathrm{s}$. \\ What is the momentum of the vehicle? \\ A $45 \mathrm{kgm} / \mathrm{s}$ \\ B $450 \mathrm{kgm} / \mathrm{s}$ \\ C $18000 \mathrm{kgm} / \mathrm{s}$ \\ D $180000 \mathrm{kgm} / \mathrm{s}$ \end{tabular} \\ \hline 5 & \begin{tabular}{l} A bullet of mass 0.10 kg travels horizontally at a speed of $600 \mathrm{~m} / \mathrm{s}$. It strikes a stationary wooden block of mass 1.90 kg resting on a frictionless, horizontal surface. \\ The bullet stays in the block. \\ What is the speed of the bullet and the block immediately after the impact? \\ A $30 \mathrm{~m} / \mathrm{s}$ \\ B $32 \mathrm{~m} / \mathrm{s}$ \\ C $60 \mathrm{~m} / \mathrm{s}$ \\ D $134 \mathrm{~m} / \mathrm{s}$ \end{tabular} \\ \hline 6 & \begin{tabular}{l} A moving body undergoes a change of momentum. \\ What is a unit for change of momentum? \\ A Nm \\ B $\mathrm{N} / \mathrm{m}$ \\ C Ns \\ D $\mathrm{N} / \mathrm{s}$ \end{tabular} \\ \hline 7 & \begin{tabular}{l} The diagram shows a uniform bridge, 4.0 m long and weighing 10000 N . \\ The bridge is pivoted at one end. A force at the other end gradually increases until the bridge begins to lift. \\ What is the lifting force as the bridge starts to move upwards? \\ A 2500 N \\ B 5000 N \\ C $\quad 10000 \mathrm{~N}$ \\ D 20000 N \end{tabular} \\ \hline 8 & \begin{tabular}{l} The diagram shows a wooden beam of weight 20 N . The centre of mass of the beam is labelled $M$. \\ There is a pivot at one end of the beam. The beam is kept horizontal by an upward force, F. \\ What is the magnitude of $F$ ? \\ A $\quad 12 \mathrm{~N}$ \\ B 20 N \\ C 30 N \\ D 33 N \end{tabular} \\ \hline \end{tabular}