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## JerJason A wet bar of soap slides freely down a ramp 8.5m long inclined at 8.0 degrees. How long does it take to reach the bottom? Assume kinetic friction is .50. one year ago one year ago

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1. hosein

Hi $mgsin \theta-\mu _{k}mg \cos \theta=ma \rightarrow a=g(\sin \theta-\mu _{k} \cos \theta)$so use this to find time of motion:$x=(1/2)at^2\rightarrow t=\sqrt{2x/a}$ where "x"is length of ramp

2. JerJason

oh wow, I had the above formula correct, I just needed that second formula. Thanks.

3. hosein

your welcome friend