An object is released from rest at a height of 25m. Calculate the time it takes to fall to the ground

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

QUESTIONS 41. An object is released from rest at a height of 25m. Calculate the time it takes to fall to the ground. 

WAEC 2002 Ans:2.24s 

SOLUTIONS 

Initial velocity u, = 0m/s

Final velocity v, = ?

Height h, = 25m

Time taken t, = ?

Acceleration due to gravity g, = 10m/s²

Using h = ut + ½gt²

25 = 0(t) + ½(10)t² 

25 = 0 + 10/2t²

25 = 5t²

t² = 25/5

t² = 5

t = √5

t = 2.24s ANSWER