Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/a in 20 s. what is te net force acting on the body?

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?

The heliocentric and the geocentric models of the solar system included these central principles

What can you increase the strength of an electromagnet by