Your brother?s mass is 55 kg, and he has a 2 kg skateboard. What is the combined momentum of your brother and his skateboard if they are going at 8.5 m/s?
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momentum is mass × velocity
total mass is 55+2 = 57
p = mv
p = 57 × 8.5
p = 484.5
this is the combined momentum of both
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