Question

 ball is thrown vertically upwards with an initial velocity of 49 m s^-1. Calculate: The time taken by it before it reaches the ground again. (Take g = 9.8 m s^-2).

Answer 1

Initial velocity, u = 49 m/s

g = 9.8 m/s²

 

Total time of flight is given by t = 2u/g

Or, t = 2(49)/ 9.8

Or, t = 10 s