1 A particle \(P\) is projected vertically upwards with speed \(24 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) from a point 5 m above ground level. Find the time from projection until \(P\) reaches the ground.
\includegraphics[max width=\textwidth, alt={}, center]{610c1d96-3833-4a71-a71c-4cac13982332-03_424_677_260_735} The diagram shows three coplanar forces acting at the point \(O\). The magnitudes of the forces are 6 N , 8 N and 10 N . The angle between the 6 N force and the 8 N force is \(90 ^ { \circ }\). The forces are in equilibrium. Find the other angles between the forces.