3 A particle \(P\) is projected with speed \(20 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) at an angle of \(60 ^ { \circ }\) below the horizontal, from a point \(O\) which is 30 m above horizontal ground.

1. Calculate the time taken by \(P\) to reach the ground.
2. Calculate the speed and direction of motion of \(P\) immediately before it reaches the ground. [4]