A hockey puck is hit on a frozen lake and starts moving withan initial speed of

Question

A hockey puck is hit on a frozen lake and starts moving withan initial speed of 12.0m/s. Five seconds later, its speed is6.0m/s. a)What is the avarage acceleration? b)What is the average value of the coefficient of kinecticfriction between puck and ice? c) How far does the puck travel during this 5.0secinterval? d)How far does the puck travel before coming rest? I know that average acceleration =vf-vi/t k=tan-a/gsin distance d=1/2at2 A hockey puck is hit on a frozen lake and starts moving withan initial speed of 12.0m/s. Five seconds later, its speed is6.0m/s. a)What is the avarage acceleration? b)What is the average value of the coefficient of kinecticfriction between puck and ice? c) How far does the puck travel during this 5.0secinterval? d)How far does the puck travel before coming rest? I know that average acceleration =vf-vi/t k=tan-a/gsin distance d=1/2at2

Explanation / Answer

average acceleration =vf-vi/t=6-12/5=-1.2m/s2 average value of the coefficient of kinectic friction between puckand ice is k*g=1.2 hence average k=0.122 distance traveled=v2-u2/2a =36-144/2*-1.2=45m distance traveled before coming to rest=144/2*1.2=144/2.4=60m

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