Find the value of \(k\) if \(P\) takes 4 seconds to reach \(Y\).
Show that \(Q\) has constant acceleration and find the magnitude and direction of this acceleration.
\item Three particles \(A , B\) and \(C\), of equal size and each of mass \(m\), are at rest on the same straight line on a smooth horizontal surface. The coefficient of restitution between \(A\) and \(B\), and between \(B\) and \(C\), is \(e\).
\(A\) is projected with speed \(7 \mathrm {~ms} ^ { - 1 }\) and strikes \(B\) directly. \(B\) then collides with \(C\), which starts to move with speed \(4 \mathrm {~ms} ^ { - 1 }\).
Calculate the value of \(e\).
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\section*{MECHANICS 2 (A) TEST PAPER 4 Page 2}