Which of the following is a U. S. unit of measurement? A. Kilogram
B. Liter
C. Foot
D. Meter

Ahot-air balloon is drifting straight downward with a constant speed of 2.40 m/s. when the balloon is 7.63 m above the ground, the balloonist decides to drop one of the ballast sandbags to the ground below. how much time elapses before the sandbag hits the ground?

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

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.