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lenaclaire lenaclaire
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11 years ago
A man weighing 660  and a woman weighing 400  have the same momentum. What is the ratio of the man's kinetic energy  to that of the woman ?
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#1
11 years ago
p = mv
and Ek = 1/2 m v^2
= m^2 v^2 /(2m)
= p^2 /2m

Hence if the objects have the same momentum, p and p^2 are identical and the Kinetic energy is proportional to the inverse of the mass

so Ek man/ Ek woman = mass woman / mass man
= 400/660
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tony123tony123
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11 years ago
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