Two objects, \(M\) and \(N\), are connected by a light inextensible string that passes over a smooth peg.
\(M\) has a mass of 0.6 kilograms.
\(N\) has a mass of 0.5 kilograms.
\(M\) and \(N\) are initially held at rest, with the string taut, as shown in the diagram below.
\includegraphics{figure_19}
\(M\) and \(N\) are released at the same instant and begin to move vertically.
You may assume that air resistance can be ignored.
- It is given that \(M\) and \(N\) move with acceleration \(a\) m s\(^{-2}\)
By forming two equations of motion show that
$$a = \frac{1}{11}g$$
[5 marks]
- The speed of \(N\), 0.5 seconds after its release, is \(\frac{g}{k}\) m s\(^{-1}\) where \(k\) is a constant.
Find the value of \(k\)
[2 marks]
- State one assumption that must be made for the answer in part (b) to be valid.
[1 mark]