Two cars are travelling side by side down a straight road in opposite directions. both cars are travelling at a speed of 22 m/s. what is their relative speed

The slope of a velocity time graph over any interval of time gives the during that interval

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

The amount of potential energy possessed by an elevated object is equal to what?