What is needed for electrical conduction to happen?

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?

Often called simply "velocity," this is the velocity of an object at a particular moment in time.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.