A stone is projected vertically upward with an initial velocity of 15ms−1. Taking upward direction as positive and the acceleration due to gravity as −9.8ms−2, answer the following.
a. (i) Calculate the velocity of the stone after 2s.
b. (ii) Determine the displacement of the stone from the point of projection after the same time.
c. (iii) Find the time taken by the stone to reach its highest point.