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A

Anonymous

Jan 06, 2025

Please help me solve this problem about a hockey puck and the coefficient of friction.?

In a shuffleboard game, a puck slides a total distance of 12 meters before coming to a complete stop. Given that the coefficient of kinetic friction between the puck and the board is 0.28, what was the puck's initial speed? The answer key indicates that the initial speed is 8.1 m/s. Could you please explain how this value is derived?

1 Answers

A
Anonymous

Dec 26, 2024

The force on the puck:

ma = -μmg (negative because deceleration is happening)

a = -μg

Use kinematics equation to find vo:

v^2 – (vo)^2 = 2ax

– (vo)^2 = 2(-μg)x

vo = sqrt(2μgx)

vo = sqrt[(2)(0.28)(9.81 m/s^2)(12 m)]

vo = 8.1 m/s

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