An autographed baseball rolls off a 0.83m high desk and strikes the floor 0.64 m away from the desk.
How fat was it rolling on the desk before it fell off? The acceleration of gravity es 9,81 m/s2
the answer in unites of m/s

Question

An autographed baseball rolls off a 0.83m high desk and strikes the floor 0.64 m away from the desk.
How fat was it rolling on the desk before it fell off?  The acceleration of gravity es 9,81 m/s2
the answer in unites of m/s

anonymous · Answer

$$2x=2ut+at ^{2}$$ $$u=o$$ $$t =\pm \sqrt{2x \div a}$$ that is the time it takes to fall if x=h so it moves at constant velocity horizontally so how fast does it have to be travelling to go 0.64m in that time?$$speed = distance \div time$$$$v _{horizontal} = x _{horizontal} \div (\sqrt{2h \div a})$$$$speed = 0.64 \div (\sqrt{2 \times 0.83 \div 9.81})$$ $$speed \approx 1.56 ms ^{-1}$$