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Sled Resistance

PHYSICSS HELP!! friction =D?

heres the problem: suppose that the sled in problem seventeen (oh boy, heres 17: a girl exerts a 36- N horizontal force as she pulls as 52-N sled across a cement sidewalk at constant speed.What is the coefficient of kinetic friction between the sidewalk and the metal sled runners. ignore air resistance.. i get how to do it but bak to the original prob.)is resting on packed snow. the coefficient of friction in now only .12. If a person weighing 650 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?

theree we r ^.. i got an answer of 78 but the answer is apparently 715. PLEASE HELP TEST TOMORRW. i will lovee u forever haha =D

Please check the answer you got. I get 84. I don't think 715 is possible because 715 is outrageous if the person weighs 650 N, and the sled 52. And yes, 650 N is about 150 regular weight... but 715 must be wrong then. Please check that again.

By the way, to find it I did this:
net force = F exerted - Ff
0 = Fexerted - Ff
Fexerted = Ff
=mew * Fn
= mew * weight
= mew * (weight of man + weight of sled)
= .12*(650+52)
=84

So check the number 715

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RAD Sportz 48 Inch Speed Training Resistance Parachute Premium Quality Running Chute Parachute $9.95 RAD Sportz continues to impress with their new running chutes. Now you can train like the top athletes of the world-- these training chutes are used in the NBA, NFL, MLB, MLS, NHL, NCAA, and in nearly every soccer program around the world. RAD Sportz's running chute combines resistance and overspeed running during the run - the two key elements of speed training.   By design it provides the optim...

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NLAAF resistance training with Bull Power Position Sled, not your ordinary speed sled

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