5. george walks to a friend's house. he walks 750 meters north, then realizes he walked too far. he
turns around and walks 250 meters south. the entire walk takes him 13 seconds. what is his speed
per second?

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m.the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.