Question

a ball is dropped from the height of 30 metres find the time it takes to reach the ground assume g = 9.8 metre seconds square ​

Answer 1

S=ut+at^2/2

u=0. (initially in hands)

g=-10m/s^2

-30=-u*t+(-10*t^2)/2

-30=0-5t^2

t^2=6

t=2.449 s