A particle P P\,P is projected with a velocity (3i+4j)ms−1(3\mathbf{i} + 4\mathbf{j})\text{ms}^{-1}(3i+4j)ms−1 from a point 20m above the ground.
Find the speed of the particle after 2 seconds.
Find the greatest height of PPP.
Find the horizontal distance travelled by P P\,P before it hits the ground.