Answer to Question #150437 in Physics for lol

Question

A book with a mass of 0.56 kg is resting on a shelf. One of the supports holding the shelf is loose and the shelf suddenly tilts to one side..  If the angle  is 25.0o (measured from the horizontal), how fast would the book accelerate)

Answer 1

Suppose that there is no friction. So,

$mg\sin\alpha=ma\to a=g\sin\alpha=9.8\cdot\sin25°=4.1(m/s^2)$ . Answer