Question

a ball is dropped from the roof of a building It takes 10s to reach the ground Find the height of the building (g=9.8m/s^2)

Answer 1

u=0m/s

t=10s

g=9.8m/s^2

S=ut + 1/2at^2

=0×10+1/2×9.8×10

=0+4.9×10

=49 m

Answer 2

the answer is 490 m

we will use the formula

s=it+½gt²

u=0
t=10
g=9.8