You and your friend peter are putting new shingles on a roof pitched at 20 ∘ . you're sitting on the very top of the roof when peter, who is at the edge of the roof directly below you, 5.1 m away, asks you for the box of nails. rather than carry the 2.0 kg box of nails down to peter, you decide to give the box a push and have it slide down to him.

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

An open cart is moving along a straight frictionless horizontal track. when rain starts falling vertically into the cart, what happens to the speed of the cart?