Question

how long will a stone take to fall to the Ground from the top of a building 80 m high and what will be the velocity of the stone on reaching the ground take g is equals to 10 metre per second square

Answer 1

S = 80 m
u = 0 m/s
By the 3rd kinematic equation
${v}^{2} = {u}^{2} + 2as$
v =
$\sqrt{1600}$
= 40 m/s

$t = \frac{v - u}{a} = 4s$

Answer 2

Answer:

4s

it would take......