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Posted by **Anonymous** on Thursday, October 27, 2011 at 12:03am.

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

9.81 m/s

2

- physics -
**drwls**, Thursday, October 27, 2011 at 8:03am0.28 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

0.685 m/s

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