acceleration is not dependent on the initial velocity of the puck, so
you'll use Newton's 2nd law to find the magnitude of the acceleration.
Since the only force (ignoring resistance from the air) is the friction
between puck and ice. Also, the friction force is negative because it
acts against the direction of motion, the equation is:
∑F = ma = -μmg
a = -μmg / m
a = -μg
(b) Use the time-independent kinematics equation:
v² = v₀² + 2aΔx
Substituting -μg for a and solving for Δx (remember, v, final velocity, is zero because the puck comes to rest):
v₀² = -2(-μg)Δx
Δx = v₀² / 2μg
May 31st, 2015
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