Consider an elevator with a table and a book on top of the table. The mass of the table is 10kg and the mass of the book is 2kg. At t=0 the elevator is moving up with a velocity of 1m/s.
At t=2s the elevator is moving up with a velocity of 8 m/s

Find the Force from the Book to the Table in N. Use the convention where a positive value(+) means upward force and a negative value(-) means downward force.