Question

A ball is thrown vertically upward with a velocity of 49 m/s. Calculate, 

i) the maximum height to which it rises. 

ii) the total time to return to the surface of the earth.

Answer 1

i) u = 49 m/s, g = 9.8 m/s².

Maximum height = u² /2g = (49 x 49)/(2 x 9.8) = 122.5 m.

ii) Total time to return to the surface of the earth = 2u/g = (2 x 49 )/9.8 = 10 s.