Where do you weigh more: at the bottom of death valley or atop one of the peaks of the sierra nevada? why?

A2-kg bowling ball is 2.5 meters off the ground on a post when it falls. just before it reaches the ground, it is traveling 7 m/s. assuming that there is no air resistance, which statement is true?

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.