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If a ball is rolling at a velocity of 1.5 m/sec and has a momentum of 10.0 kg·m/sec, what is the mass of the 
ball?

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Momentum = (mass) x (speed)

10 kg-m/sec = (mass) x (1.5 m/s)

Divide each side by  1.5 m/s :

Mass =  10 kg-m/sec / 1.5 m/s  =  (6 and 2/3) kg

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