Question

you drop a rock off the top of a tall building how tall is the building if it hits the ground 8.0 sec letter? what is the impact velocity of the rock

Answer 1

it depends on the mass of the rock

Answer 2

U=0
t=8
a or g=9.8
so,
v=u±at
v=u±gt
v=0±9.8*8
v=78.4