At an accident scene on a level road, investigators measure a car’s skid mark to be 88 m long. the accident occurred on a rainy day, and the coefficient of kinetic friction was estimated to be 0.42. use this data to determine the speed of the car when the driver slammed on (and locked) the brakes. use the work-energy principle to solve this problem. (while you are doing the problem think about why the car’s mass does not matter.)

27 m/s

Explanation:

Given

car's skid length is 88 m long

coefficient of kinetic friction is 0.42

let the mass of car be m and v be the velocity with which it was running initially.

Friction force

work done by friction force =change in the kinetic energy of car

work done by Friction

Change in the Kinetic Energy

Mass of car does not matter because in the final expression m gets cancelled.

when earth is in rotational motion around the sun,it displaces from its place.

when a ball is placed on an inclined surface it does both the rotational and circular motion.

explanation: