m0makerdell m0makerdell

30-03-2016
Physics

Answered

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?

Verified Answer :

30-03-2016

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 .

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