A ball is thrown vertically upwards with an initial velocity of 20 m/s. Neglecting air resistance, what is the total time of flight (time to reach the highest point and return to the ground)? (g = 10 m/s²)
Correct: B
The time to reach the highest point is given by t = u/g = 20/10 = 2 s. The total time of flight is twice the time to reach the highest point, so T = 2t = 2 * 2 = 4 s.