Question1
A backpack full of books weighing 53.0 rests on a table in a physics laboratory classroom. A spring with a force constant of 140 is attached to backpack and pulled horizontally. If backpack begins to slide when the spring (= 140) stretches by 2.50, what is the coefficient of static friction between backpack and table?
Question2
The driver of a 1700 car travelling on a horizontal road at 120 rapidly applies the brakes. Because of a slippery pavement, the friction of the road on the tires of the car, which is what slows down the car, is 26.0 of the weight of the car.
What is acceleration of the car?
How many meters does it travel before stopping in these conditions?