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A 15-kg bicycle carrying a 50-kg boy is traveling at a speed of 5 m/s. What is the KE of the bicycle and the boy?
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A 15-kg bicycle carrying a 50-kg boy is traveling at a speed of 5 m/s. What is the KE of the bicycle and the boy?

User Betasux
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1 Answer

3 votes
Together as one moving package, their mass is (15 + 50) = 65 kg.

Kinetic energy = (1/2) (mass) (speed)²

= (1/2) (65 kg) (5 m/s)²

= (32.5 kg) (25 m²/s²)

= 812.5 kg-m²/s² = 812.5 joules .
User Ethan Malloy
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7.7k points
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