Question

An object is dropped from a height of 80 m. It will remain in air for time [Take g = 10 m/s2] with formula

Answer 1

Use the formula
s = ut + 1/2gt2 ( it is t square)
Where s = 80
u = 0
g = + 10

Answer 2

Hi friend,

We know that

S= ut+1/2 at²

Since initial velocity is zero,ut =0.

S= 1/2 at²

t² = 2S/a

t² = 2×80/10

t= 4secs.

Hope this helped you a little!!!!