Four particles, each with mass m, are arranged symmetrically about the origin on the x axis. a fifth particle, with mass m, is on the y axis. the direction of the gravitational force on m is:

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?

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?