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A block starts at rest and slides down a fric- tionless track except for a small rough area on a horizontal section of the track (as shown in the...

A block starts at rest and slides down a fric-
tionless track except for a small rough area on
a horizontal section of the track (as shown in
the figure below).
It leaves the track horizontally, flies through
the air, and subsequently strikes the ground.
The acceleration of gravity is 9.8 m/s2 .

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