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A runaway semi-truck that has a mass of 35,576 kg travels down a hill at a velocity of 118 km/hr. (a) What is the magnitude of the momentum of the semi-truck?

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Answer:

4,197,968 kg km/hr

1,166,102 kg m/s

Explanation:

Momentum is mass times speed.

p = mv

p = (35,576 kg) (118 km/hr)

p = 4,197,968 kg km/hr

Or, converting to SI units:

p = 4,197,968 kg km/hr × (1000 m/km) × (1 hr / 3600 s)

p = 1,166,102 kg m/s

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