A hockey puck (mass 4 kg) leaves the players stick with a speed of 15 m/s and sl

Question

A hockey puck (mass 4 kg) leaves the players stick with a speed of 15 m/s and slides on the ice for 20 meters before coming to rest. What is the magnitude of the acceleration on the puck? Vo+2aAx m/s2 Submit Answer Incorrect. Tries 1/3 Previous Tries What is the magnitude of the friction force exerted on the puck due to the ice? Submit Answer Tries 0/3 What is the normal force on the puck? Submit Answer What is the friction coefficient between the puck and the ice? Tries 0/3 (unitless) Submit Answer Tries 0/3

Explanation / Answer

a) from the equation v^22 = v0^2+2ax

here v = 0

v0 = 15 m/s

x = 20 m

2ax = -v0^2

a = -v0^2/2x = -15^2/2*20 = -5.625 m/s^2

magnitude a = 5.625 m/s^2

b) ma = frictionla force

f = 4*5.625 = 22.5 N

c) normal force n = mg = 4*9.8 = 39.2 N

d) friction = mue*normal force

mue = 22.5/39.2 = 0.574

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