Question attached. :)

What changes would result in a decrease in the gravitational force between two objects? check all that apply.

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?