Question

A stone is dropped from the roof of a building . It takes 4 seconds to reach the ground . Find the height of the building . (Take g = 9.8 m/s^2) ​

Answer 1

h = 1/2gt²

h = 1/2 × 9.8 × 4

h = 19.6 m

Answer 2

Answer:

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Given,

Initial velocity = u = 0

time taken = t = 4s

acceleration = g = 9.8 m/s²

Using 2nd equation of motion we get,

x=ut+1/2at²

=(0) (4) + (1/2) (9.8) (4) (4)

= 78.4m

So, the height of the building is 78.4 m.