Ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

 C)5.65 m/s

Explanation: usatestprep ..

Both Ray and his wrestling partner have kinetic energy by virtue of them moving. Ray has a mass   , velocity     .  Ray's kinetic energy is calculated as follows,

Bobby wishes to archive the same amount of kinetic energy as Ray. To find what his velocity should be, we have to solve for     in the kinetic energy formula. For Bobby,      , mass  .

So,

.

This means for Bobby to have the same kinetic energy as Ray, he has to run at

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