Question

hey.... help me in solving this
A stone is dropped horizontally with speed 5ms from the top of building of height 20m. Time taken by the body to reach the ground is

4s
2s
5s
3s​

Answer 1

Answer:

2 seconds

Explanation:

H=20 m

a=g=10m/s2

initial v=0

from second equation of motion,

s= ut+1/2gt2

20= 0+5t2

t2=4

t=√4

t=2sec

hence the time taken by the body to reach the ground is 2s