What is the usefulness of the representation for drawing a strait line for a light ray without the arrow?

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?

What is the single most important equation in all of physics?

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little