Question

how long will a stone take to fall from a height of 80m and then what will be the velocity of stone on reaching the ground​

Answer 1

Hope it will be helpful

Solution:-

S=ut+1/2at^2

80=0xt + 10t^2/2

80=10t^2/2

t^2=2x80/10

t^2=16

t=√16

t =4 sec

so velocity :

v=u+at

v=0+10x4

v= 40

So, Time = 4 sec

Velocity =40 m/s