Homework Help: physics 221

Posted by Anonymous on Friday, October 12, 2012 at 10:18pm.

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An 8.61-kg block slides with an initial speed of 1.72 m/s down a ramp inclined at an angle of 27.4° with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.73. Use energy conservation to find the distance the block slides before coming to rest.

physics 221 - Elena, Saturday, October 13, 2012 at 5:43am
ΔKE+ΔPE=W(fr)
m•v²/2+m•g•s•sinα = μ•m•g•s•cosα
s=v²/2g(μ•cosα- sinα) = 1.72²/2•9.8(0.73•cos27.4 –sin27.4)=0.8 m

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