An autographed baseball rolls off of a 1.3

Question

m high desk and strikes the floor 0.15 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/s
2
.
Answer in units of m/s.

Answer 1

find the fall time ... 1.3 = 1/2 g t^2

rolling speed = .15 m / (fall time)