The equation s = V30rd can be used to find a car's speed s in miles per hour given the length d feet of a skid mark and the friction
factor f of the road. Police measured a skid mark of 90 feet on a dry
concrete road. If the speed limit is 35 mph, was the car speeding? Explain.

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the