30 points, brainiest, high school physics problem, please help.

Shelly experiences a backward jolt when the driver starts the school bus. which of the following explains this phenomenon? a. the inertia of shelly b. the inertia of the bus c. the normal force of the seats on shelly d. the net force acting on shelly in a backward direction e. a zero net force acting on shelly

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

What organization and environment is described above?