Three vehicles are traveling at the same speed in the same direction on a highway, as shown in the diagram below. if the position of the front of the white van is -21 m, what is the point of reference?

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

The velocity of a car traveling in a straight line increases from 0 meters/second to 30meters/second in 8 seconds. what is the average acceleration of the car?