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[" 8.A stone tied to one end of string,"...

[" 8.A stone tied to one end of string,"5m" long "],[" is whirled in horizontal circle at constant "],[" speed "5m/s" .What is average acceleration "],[" of the stone in half revolution? "],[[" a."5 pi m/s^(2)," b."(5)/(pi)m/s^(2)],[" C."(10)/(pi)m/s^(2)," d.Zero "]]

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