A ball bearing is projected vertically upwards from the ground with a velocity of 15m/s. Calculate the time taken by the ball to return to the ground

Physics Jamb, Waec, Neco Past Questions & Answers on Speed, Velocity and Acceleration

QUESTIONS 32. A ball bearing is projected vertically upwards from the ground with a velocity of 15m/s. Calculate the time taken by the ball to return to the ground, [g 10m/s²]

WAEC 2004 Ans: 3.0s 

SOLUTIONS 

initial velocity u= 0m/s

Final velocity v= 15m/s

Time t taken= ?

acceleration due to gravity g, = 10m/s²

Using v = u + gt

t = 2(v-u)/g

t = 2(0-15)/10.

t = 2 x 15/10

t = 30/10

t = 3s