Calculate the kinetic energy of sprinter (85.2 kg) moving at 38.0 km.h -1 . | General Chemistry 1

E k = 1 2 mv 2 with v = speed in m.s -1 38 km.h -1 = 38 km 1 hour x 1000 m 1 km x 1 hour 3600 s = 10.6 m.s -1 E k = 1 2 x 85.2 x 10.6 2 = 4.79 x 10 3 J

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Scientific measurement - 1 | Chemistry and the Scientific Method

Chapter 1 - Chemistry and the Scientific Method

Calculate the kinetic energy of sprinter (85.2 kg) moving at 38.0 km.h^-1.

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Solution

E_k =

\frac{1}{2}

mv² with v = speed in m.s^-1

38 km.h^-1 = $\frac{38 km}{1 hour}$ x $\frac{1000 m}{1 km}$ x $\frac{1 hour}{3600 s}$ = 10.6 m.s^-1

E_k = $\frac{1}{2}$ x 85.2 x 10.6² = 4.79 x 10³ J

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Scientific measurement - 1 | Chemistry and the Scientific Method

General Chemistry 1 - Scientific measurement - 1