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 The kinetic energy E, of a body moving with a velocity vv is given by the equation E = 12mv2 12mv2, where mm is the mass of the body. Find the mass of a body

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The kinetic energy E, of a body moving with a velocity vv is given by the equation E = 12mv2 12mv2, where mm is the mass of the body. Find the mass of a body moving with a velocity 98 m/s and having an energy of 3528 N. (Round the answer to two decimal places.)

 Jun 5, 2016

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 #1
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We  have:  E = (1/2)*m*v2

 

So:  m = 2*E/v2

 

Here:  m = 2*3528/982 kg  or m ≈ 0.37 kg

.

 Jun 5, 2016
 #2
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Incidentally, you can't have the energy in Newtons (a measure of force).  I suspect you meant Joules (which is what I've assumed in my calculation above).

Alan  Jun 5, 2016
 #3
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It's actually around .73kg

 Aug 24, 2016

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