# Physics

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A hockey puck is hit on a frozen lake and starts moving with a speed of 13.80 m/s. Exactly 6.7 s later, its speed is 7.10 m/s.

a) what is the puck's average acceleration?

b) what is the coefficient of kinetic friction between the puck and the ice?

• Physics -

acceleration=changevelocity/time

forcefriction=mass*a you know a, and mass

force friction=mu*mg

mu*g=a
solve for mu.

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