This is an energy problem. Because we are given mass and velocity we know to use the formula for kinetic energy.
KE=1/2(mass)*(velocity)^2
KE=1/2(82 kg)*(6.0 m/s)^2
KE=1476 J
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A rugby player of mass 82kg is running at 6.0m/s. How much energy will be needed to stop him?
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