Hi Everyone, I'm trying to find the initial speed of a motorcycle that was involved in an accident. The driver lost control and the bike dragged along the asphalt for some distance. I know several variables but my physics is not a strong suit to say the least. Any help would be much appreciated! Here is what I know: - bike travelled on its side (independently of the driver) for 200 meters - nothing but the friction of the road brought the bike to a stop - grade of the road - uphill approx 10 degrees - motorbike weight - approx 145 kg - dry road - coefficient of friction of asphalt? I'd like to know several things: - the initial speed - the formula used to find the initial speed - if the type (i.e. rubber vs metal vs plastic) of contact points and actual surface area of the contact points of the bike on the asphalt make a difference for this calculation and if so how would that factor into the formula? Negligible? Can reasonable assumptions be made for a reasonably accurate initial speed? Thanks in advance!