To calculate the speed of an object traveling down a zip line, you must know A. the speed and direction of motion.
B. the distance traveled over a period of time.
C. the mass and velocity of the object.
D. the average speed.

You notice a very one-dimensional-thinking snail crawling along one rail of a railroad track. naturally, you remove it to a safer place. but before you do, you observe it as it moves from position xi = -92.9 cm to position xf = -64.9 cm along the rail, as measured from a point where one rail abuts the next. what is the snail\'s displacement δx in centimeters?

Why does lightning travel from clouds to the ground?

Which planet do you think would be easiest for humans to colonize some day?