Physics Homework help
A ball is dropped from a ledge 20m high. At what height will the ball be at when it is moving 18m/s?
October 30, 2013
Physics Homework help
A ball is dropped from a ledge 20m high. At what height will the ball be at when it is moving 18m/s?
1 Comment • Newest first
v*f = a(t)
t = 18 m/(9.8 m/s^2) = 1.8 s
sf = si + vi*t + (a/2)(t^2)
sf = 1/2 * (9.8 m/s^2) * (1.8 s)^2
sf = 16 m from where you dropped it or 4 m from the ground