Jaylen is a championship runner of the school's track team. During one of his trials, his speed was measured at 15.1 m/s. Find Jaylen's kinetic energy during that trial if his mass is 54.6 kg.

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Physics

Rico

19 July, 00:56

Jaylen is a championship runner of the school's track team. During one of his trials, his speed was measured at 15.1 m/s. Find Jaylen's kinetic energy during that trial if his mass is 54.6 kg.

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Christina Hutchinson · Answer 1

Kinetic energy of any moving object = (1/2) (mass) (speed) ²

Jaylen's KE = (1/2) (54.6 kg) (15.1 m/s) ²

KE = (27.3 kg) (228.01 m²/s²)

KE = 6,224.7 kg-m²/s²

KE = 6,224.7 Joules

That may sound like a lot of KE. But Jaylen's speed of 15.1 m/s is almost 50% faster than Usain Bolt's average speed for his world's record in the 100 meters, so you'd naturally expect amazingness from Jaylen.