Question

an object is dropped from a height of 80 m. it wil remain in air for time (take g =10m/s square

Answer 1

Hi friend,

We know that,

S= ut +1/2 at²
Initial velocity =0.

T² = 2s/a

t²= 2×80/10

t= 4 secs.

Hope this helped you a little!!!

Answer 2

We use the formula of kinematics here.Also since the time can't be negative the ans is positive 4.