Question

a stone dropped from seconds to reach the ground. calculate the height of the building. (a= 9.8 m/s)?​

Answer 1

For time, we have:

t=√2h/g

Then:

t²=2h/g

4 x 9.8=2h

h=2 x 9.8

=19.6m

Then:

v=√2gh

=√19.6 x 19.6

=19.6 m/s