yedida
yedida
20.11.2020 • 
Physics

A race dog is initially running at 10 m/s but is slowing down. How fast is the dog moving when its kinetic energy has been reduced by half? A boulder with a mass of about 1.5 x10^5 kg falls and strikes the ground at 70 m/s. How much kinetic energy does the boulder deliver to the ground? in joules

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