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A 12-kg ball is connected to a string and is moving within the
horizontal plane. If the force in the string F pulls the string in
so that its length is a function of time as shown, determine
the speed of the ball when t=5 s. Initially, the ball was given
a velocity of 10 m/s that was perpendicular to the string.
Also, what is the total work done by F during this process?
FBD within
horizontal plane:
M₂-0
Σ[Μ = 0

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