# physics

At the end of a race a runner decelerates from a velocity of 7.00 m/s at a rate of 0.400 m/s^2.

(a) How far does she travel in the next 15.0 s

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1. x=vt+(1/2)*a*(t)^2

x=7*15-(1/2)*4*(15)^2

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2. At the end of a race a runner decelerates from a velocity of 7.00 m/s at a rate of 0.300 m/s2.

b) What is her final velocity?

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3. A helicopter blade spins at 110 revolutions per minute. Its tip is 5.50 m from the center of rotation.

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