Question

Dont answer if u dont know or else iwill report.
A stone falls from the top of the building and reaches the ground 5 s later. How high is the building? (Take g = 9.8 m s-1 )​

Answer 1

Explanation:

Initial velocity, u = 0 m/s

Acceleration due to gravity, g=9.8 m/s

2

Time taken to reach the ground, t = 2.5 sec

Height, h = ?

Using relation,

s=u t+

2

1

gt

2

s=0×2.5+

2

1

×9.8×2.5×2.5

s=0+4.9×2.5×2.5

s = 30.625 m