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Which has more kinetic energy: a 0.0011-kg bullet traveling at 406 m/s or a 5.4  107-kg ocean liner traveling at 15 m/s (29 knots)?

the bullet has greater kinetic energy

the ocean liner has greater kinetic energy    


Justify your answer.

Ek-bullet =            J

Ek-ocean liner =            J
 

 Oct 29, 2021
 #1
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Which has more kinetic energy: a 0.0011-kg bullet traveling at 406 m/s or a 5.4  107-kg ocean liner traveling at 15 m/s (29 knots)?   

 

I would say the ocean liner has more energy.  I can stop a bullet with my chest – not that I would want to – but an immense ocean liner would crush me like stepping on an ant.  I know that energy is mass times velocity squared, but I'm unable to calculate the energy values because I don't know what "5.4  107-kg" means. 

.

 Oct 29, 2021
 #2
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+1

Well.....just think about it....if the bullet hit the liner, would it knock the ship backwards....or not?

 

KE = 1/2 m v2

 

bulletke = 1/2 (.0011) (406)2         joules

linerke   = 1/2 (5.4 * 107) (15)2   joules                  calculate to find the greater.....

 Oct 29, 2021

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