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A 4 kg bird has 18 joules of kinetic energy and is rolling 3 m/s. find the mass ?
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A 4 kg bird has 18 joules of kinetic energy and is rolling 3 m/s. find the mass ?

User Edmund Rojas
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KE = half of mass times squared speed
18 = 0.5 * mass * (3m/s)^2
18 = 4.5 mass
mass = 18 / 4.5 = 4 kg

User Daniel Gerber
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