# 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?

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?

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Step 1

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

Step 2

(b) The kinetic energy required...

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