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PhysicsQ&A LibraryA 68.1 kg runner has a speed of 3.50 m/s at one instant during a long-distance event. For (a) Apply the definition of kinetic energy. For (b) use the work-energy theorem. (a)What is the runner's kinetic energy at this instant (in J)? (b)How much net work (in J) is required to triple her speed?Question

Asked Dec 8, 2019

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A 68.1 kg runner has a speed of 3.50 m/s at one instant during a long-distance event.

For (a) Apply the definition of kinetic energy. For (b) use the work-energy theorem.

(a)

What is the runner's kinetic energy at this instant (in J)?

(b)

How much net work (in J) is required to triple her speed?

Step 1

(a) The runner’s kinetic energy at the instant is

Step 2

(b) The kinetic energy required...

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