What would cause a backpack sitting on the floor of the school bus to suddenly fly forward?
a)the bus makes a hard turn to the right
b) the bus is going backward and suddenly stops
c)the bus makes a hard turn to the left
d)the bus is going forward and suddenly stops

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.