suppose you hold a book in one hand and a flat sheet of paper into another hand. You dropped them both, and they fall to the ground. Explain why the falling book is good example of free fall, but the paper is not.

A m1 = 5.01-kg block is placed on top of a m2 = 10.0-kg block (figure). horizontal force of F = 45.0 N is applied to the 10.0-kg block, and the 5.01-kg block is tied to the wall. The coefficient of kinetic friction between all moving surfaces is 0.182.(a)Draw a free-body diagram for each block and identify the action–reaction forces between the blocks.(b) Determine the tension in the string in magnitude of newtons.(c) Determine the magnitude of the acceleration of the 10.0-kg block.

A 1700 kg car is driving down a highway at a constant velocity when a deer jumps out onto the road 59.6 m ahead. The coefficient of friction between the car tires and the road is 0.21.    Calculate the initial velocity of the car if it is able to stop just before hitting the deer. (You do not need to account for reaction time of the driver. Assuming the car is breaking the entire 59.6 m distance and that friction is the only force stopping the car.)  v0 =          m/s

Two blocks are in contact on a frictionless horizontal surface. The blocks are accelerated by a single horizontal force applied to the block m1. Where F = 150.0N , m7= 18 kg, and m2= 12 kg. The contact force of block 1 on block 2 is F m1 m2 О 300 N O 60 N O 120 N O 90 N