Question

A ball is projected horizontally from a height of hundred metre from the ground with a speed of 20 metre per second taking g is equal to 10 metre per second the time taken to reach the ground is

Answer 1

Given,
S=100m/s
u=20m/s
v=?
t=?
So,v2=u2+2as
v2=20*20+2*10*100
v2=400+2000
v2=2400
v=48.98m/s
now,v=u+at
48.98=10t
t=48.98/10
t=4.8sec