1 A particle \(P\) is projected vertically downwards with speed \(14 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) from a point 30 m above the ground.
- Calculate the speed of \(P\) when it reaches the ground.
- Find the distance travelled by \(P\) in the first 0.4 s of its motion.
- Calculate the time taken for \(P\) to travel the final 15 m of its descent.