A stone is released from a height of 80m above the ground. Calculate its velocity just before it strikes the ground

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

QUESTIONS 36. A stone is released from a height of 80m above the ground. Calculate its velocity just before it strikes the ground.

NECO 2003 Ans: 40m/s

SOLUTIONS 

initial velocity u= 0

Final velocity v =?

height h = 80m

Acceleration due to gravity g; 10m/s²

Using V² = U² + 2AS

v² = 0² + 2(10)(80)

v² = 0 + 20 (80)

v² = 20 x 80

v² = 1600

v = √1600

v = 40m/s