Problem: Which of the following objects has the greatest kinetic energy?(a) a 500-kg motorcycle moving at 100 km/h (b) a 1,000-kg car moving at 50 km/h(c) a 1500-kg car moving at 30 km/h (d) a 5000 kg truck moving at 10 km/h (e) a 10,000-kg truck moving at 5 km/h

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Kinetic Energy (K.E.)

K.E.=12mv2

Ekinetic energy = J
m = mass, in kg
v = velocity of the e- = m/s


(a) a 500-kg motorcycle moving at 100 km/h 

K. E.=12500 kg100kmh×103 m1 km×1 h3600 s2K. E.=12(500 kg)(27.7778ms)2K. E.=12500 kg771.6 m2s2K. E.=385802 kg·m2s2

kg·m2s2=J

K. E. = 385802 J



(b) a 1,000-kg car moving at 50 km/h

K. E.=121000 kg50kmh×103 m1 km×1 h3600 s2K. E.=12(1000 kg)(13.8889ms)2K. E.=121000 kg192.9m2s2K. E.=192901 kg·m2s2

kg·m2s2=J

K. E. = 192901 J

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Problem Details

Which of the following objects has the greatest kinetic energy?

(a) a 500-kg motorcycle moving at 100 km/h 

(b) a 1,000-kg car moving at 50 km/h

(c) a 1500-kg car moving at 30 km/h 

(d) a 5000 kg truck moving at 10 km/h 

(e) a 10,000-kg truck moving at 5 km/h

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