A hockey puck is hit on a frozen lake and starts moving with aspeed of 10.7 m/s.

Question

A hockey puck is hit on a frozen lake and starts moving with aspeed of 10.7 m/s. Five seconds later,its speed is 5.60 m/s. (a) What is its average acceleration?
1 m/s2

(b) What is the average value of the coefficient of kineticfriction between puck and ice?
2

(c) How far does the puck travel during the 5.00 s interval?
3 m (a) What is its average acceleration?
1 m/s2

(b) What is the average value of the coefficient of kineticfriction between puck and ice?
2

(c) How far does the puck travel during the 5.00 s interval?
3 m

Explanation / Answer

its average acceleration a=(5.6-10.7)/5= -1.02m/s2 (b) the average value of the coefficient of kineticfriction between puck and ice a=m*g*/m=g=> =0.104 (c)distance traveled: d=10.7*t +a*t2/2 t=5 s a=-1.02 m/s2 => d=40.75m => d=40.75m

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