posted by Anonymous .
An autographed baseball rolls oﬀ of a 0.82 m
high desk and strikes the ﬂoor 0.28 m away
from the desk.
How fast was it rolling on the desk before
it fell oﬀ? The acceleration of gravity is
0.28 m = (horizontal velocity component)*(fall time)
The fall time is sqrt(2H/g) = 0.4089 s
H = 0.82 m
Solve for the horizontal velocity component