Question

We a body falls 80m .it time of decent

Answer 1

Hey MATE!!

Let the initial velocity is 'u', since it starts falling therefore value of

u is 0.

Height 'h' is given to us equal to 80m.

We consider gravitational acceleration in the case of object in vertical motion whose value we take as 9.8 ≈10m/s^2.

We now apply 2nd equation of motion in vertical to find out time.

h= ut + (gt^2)/2

80 = (0)(t) + {(10)(t^2)}/2

80 = 0 + 5 t^2

t^2 = 80/5

t^2 = 16

t = √16

t = 4 sec Answer

Hope it helps

HAKUNA MATATA :))