Question

An autographed baseball rolls off of a 1.4 m
high desk and strikes the floor 0.25 m away
from the desk.
How fast was it rolling on the desk before
it fell off? The acceleration of gravity is
9.81 m/s2 .
Answer in units of m/s

Answer 1

distance you fall in t seconds is
d= 0.5*g*t^2
you know d (it is 1.4 m), and you know g (9.81 m/s^2) so you can find t
the distance you go horizontally is
d= v*t
you know horizontal d (0.25 m), you know t (see above), so you can find v.