Question

A hoodlum throws a rock straight down from the roof of a building 109m high. If it takes 2.40s to hit the ground below, with what initial speed was the rock thrown?

Please show all work
If thrown down with initial velocity v, then just solve

109 - vt - 4.9t^2 = 0

plug in t=2.40 and find v.

Related Questions

A girl standing on top of a roof Throws a rock at 30m/s at an angle 30 degrees below the horizontal... A girl standing on top of a roof Throws a rock at 30m/s at an angle 30 degrees below the horizontal... A girl is standing on top of a roof and throws a rock at 30 m/s at an angle of 30 Degrees below the...