Kinetic Energy

  • Thread starter thomas49th
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  • #1
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Hi, I know the kinetic energy equation is

Kinetic Energy(J) = 0.5 x Mass (Kg) x velocity² (m/s)

So how do I rearrange it. Ive been having problems with it

I have a question here

What is the weight of an object travelling at 2m/s with 2J of kinetic energy?


the answer is 10N, but how?

Thanks
 

Answers and Replies

  • #2
radou
Homework Helper
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What is the weight of an object travelling at 2m/s with 2J of kinetic energy?
If you know the velocity and the kinetic energy of the object, what can you calculate from the definition of kinetic energy? You wrote it down already.
 
  • #3
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write it like this
2J=(1/2)m(2m/s)^2
algebra.
then you need to get weight from mass.
 
  • #4
655
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1N so weight is

1 x 10 = 10N/Kg?
 
  • #5
radou
Homework Helper
3,115
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1N so weight is

1 x 10 = 10N/Kg?
If you round up g to equal 10, then you have W = mg = 1 [kg] * 10 [m/s^2] = 10 [kg m /s^2] = 10 [N] ! Watch out for units!
 

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