A car, with mass 1,5 tons, is travelling on a horizontal road with a speed of 100 km/h when the driver slams on the brakes. The car skids to a stop over a distance of 20 m. (So during this skidding only the kinetic friction force is acting in the horizontal direction). Calculate the coefficient of kinetic friction between the car and the road.

Question

A car, with mass 1,5 tons, is travelling on a horizontal road with a speed of 100 km/h 	when the driver slams on the brakes. The car skids to a stop over a distance of 20 m. (So 	during this skidding only the kinetic friction force is acting in the horizontal direction). 	Calculate the coefficient of kinetic friction between the car and the road.

mos1635 · Answer

try to aplay energy work theorem.....

anonymous · Answer

Convert the given into SI units. 1.5 tons into kg, 100km/h into m/s.
Look for the given like Vi and Vf and X. Vf is indicated in the problem, just not a number.
Get the acceleration (or deceleration).
Use the equation: $$F=m _{k}n$$ to get the coefficient of kinetic friction.

HTH