Answer:
The force on the book is 250N.
Step-by-step explanation:
Newton's second law states that the equation for the force is:
In which m is the mass, in kilograms, and a is the acceleration, in m/s². F is the force measured in N.
In this question:
So
check the picture below, you can pretty much count the units off the grid.
recall that A = (1/2)bh.
the answer is on the picture
Answer:101°
79 + 101=180