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Q. A 1.20 brick is sliding next to on a rough horizontal surface at 15.0 .If the brick stops in 4.30, how much mechanical energy is lost?

Q. A stone with a mass of 0.90 kg is attached to one end of a string 0.80 m long. The string will break if its tension exceeds 500N. The stone is whirled in a horizontal circle on a frictionless table top: the other end of the string is kept fixed. Find the highest speed the stone can attain without breaking the string.

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