A stone is dropped from the top of a tower of height 11.25m. Calculate the time it will take to reach the ground

John Perolski
August 09, 2023

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

QUESTIONS 43. A stone is dropped from the top of a tower of height 11.25m. Calculate the time it will take to reach the ground. 

NECO 2004 Ans: 1.50s

SOLUTIONS 

  • Acceleration due to gravity g, = 10m/s²
  • Initial velocity u, 0m/s
  • Final velocity v, ?
  • Height h, = 11.25m
  • Time taken t, = ?


Using h = ut + ½gt²

11.25 = 0xt + ½(10)t²

11.25 = 0 + 10/2t²

11.25 = 5t²

t² = 11.25/5

t² = 2.25

t = √2.25

t = 1.50s ANSWER