4 A small ball \(B\) is projected from a point 1.5 m above horizontal ground with initial speed \(29 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) at an angle of \(30 ^ { \circ }\) above the horizontal.
- Show that \(B\) strikes the ground 3 s after projection.
- Find the speed and direction of motion of \(B\) immediately before it strikes the ground.