For this case we have that by definition, the kinetic energy is given by the following formula:

Where:
m: It is the mass
v: It is the velocity
According to the data we have to:

Substituting the values we have:

finally, the kinetic energy is 
Answer:
Option A
Answer:
hydrogen
helium
oxygen
Explanation:
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1140x9.8x2.4= 26,812.8 significant figures Make it 27,000