Question

A stone released with zero velocity from the top
of a tower, reaches the ground in 4 sec. The height
of the tower is (g = 10m/ s² )
(a) 20 m (b) 40 m
(c) 80 m (d) 160 m

Answer 1

Answer:

s is distance, the height of the tower. a is acceleration, the 9.8 m/s^2 of gravity near Earth. t is time, 4 seconds. s = 1/ ...

Answer 2

Answer:

H=1/2gt^2 (s=ut+1/2at^2)

  =1/2*10*4*4

  =5*4*4

  =80 m