Hey guys! I REALLY need some help with my physics. Here is one of my two questions: 1) With what rate of acceleration will a cart roll down a ramp inclined at an angle of 27 degrees? Assume the wheels of the cart are frictionless I have NO idea how to even get started. Here is the second one, 2) A coin is placed on a book that is slowly opened. It is noted that the coin does not start to move untill the opening angle is 25 degrees. What is the coeficient of friction between the book and the coin? THANKYOU in advance if you can help at all!