Vinny m 40 kg is at rest on ice which well assume is, Ask an Expert

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Vinny (m= 40 kg) is at rest on ice ( which we'll assume is frictionless) holding a gun ( m=1 kg). Each bullet in the gun has a mass of 20 grams and fires at 400 m/s.

a) How many bullets must he fire to achieve a speed of 6 m/s?

b) How much chemical energy was stored in the unfired bullets assuming 60% of it is transformed into thermal energy?

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