4. In this question use \(\boldsymbol { g } = \mathbf { 9 . 8 1 } \mathbf { m ~ s } ^ { \mathbf { - 2 } }\)
Two particles, of mass 1.8 kg and 1.2 kg , are connected by a light, inextensible string over a smooth peg.
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1. Initially the particles are held at rest 1.5 m above horizontal ground and the string between them is taut. The particles are released from rest.
   Find the time taken for the 1.8 kg particle to reach the ground.
2. State one assumption you have made in answering part (a).