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Compare the kinetic energies of the following:

a) A baseball (mass=0.145kg) moving at 100 km/h.

b) A runner (mass = 75 kg) moving at 30km/h.

c) A swimmer (mass = 75 kg) moving at 7 km/h.

d) A discus (mass = 2 kg) moving at 20 m/s.

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to convert km/hr to m/s either use Google or head.
for example
7 km/hr(1 hr/3600 seconds)(1000 m/km)
= 7 /3.6

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