A ball is dropped from a height of 45m above the ground. Calculate the velocity of the ball just before it strikes the ground.

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

QUESTIONS 26: A ball is dropped from a height of 45m above the ground. Calculate the velocity of the ball just before it strikes the ground. 

WAEC 1994 Ans:30m/s

SOLUTIONS 

Always remember that

1. When an object is thrown upwards, its final velocity,  v  Initial velocity u =0 

2. When an object falls downward or is released from a eig , 1 come down 

3 The time it takes an object to travel upwards is the same t,me it takes to come 

Initial velocity u, = 0m/s

Final velocity v = ?

Acceleration due to gravity g, = 10m/s²

Height h, 45m

USING v² = u² + 2gh

v² = 0² + 2 x 10 x 45

v² = 0 + 900

v² = 900

v = √900

v=  30m/s Answer