Which object is accelerating downward at the slowest rate?
a bird's feather falling from a tree branch to the ground
a rock dropped from the roof of a tall building
a baseball just after it is struck for a home run
a model rocket falling to the ground after it has reached its maximum height

You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when you are finished

Mary starts from her house, walks 80 meters south, and stops to chat with her aunt on the sidewalk. after chatting for a few minutes, she walks 125 meters to the west to meet a friend and then walks 45 meters north with her friend to a cafe for lunch. overall, she takes 10 minutes to do all this. what is mary’s average speed?

Two point charges, separated by 1.5cm, have charge values of +2.0 and-4.0 uc, respectively. what is the value of the mutual force between them