A car is moving along a highway when the driver has to make an emergency stop. The wheels of the car lock and cease rolling. The car skids and leaves straight-line skid trails between the point where the braking began and the point where the car comes to rest. The skid trails are 27.9 m long. The coefficient of kinetic friction between the car’s tires and the road is 0.512. At what speed was the car moving when its wheels locked?
A motorcycle of mass 245 kg has an acceleration of 3.50 m/s2 while traveling at 90.00 km/h. The forces resisting the motorcycle’s motion, including friction and air resistance, total 400 N. What is the magnitude of the force that motorcycle exerts backward on the ground to produce its acceleration?
If half of the weight of a small utility truck with a mass of kg is supported by its two drive wheels, what is the maximum magnitude of acceleration that the truck can achieve on dry concrete if the coefficient of static friction of the truck’s tyres on dry concrete is 1.0?