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## Homework Statement

At a time 0.22 seconds after it has been hit by a tennis racket, a tennis ball is located at (6, 8, 0) m, relative to an origin in one corner of a tennis court. At a time 0.26 seconds after being hit, the ball is located at (6.52, 8.16, 5.88) m. Calculate the following results, and include correct units:

(b) What is the average speed of the tennis ball?

## Homework Equations

## The Attempt at a Solution

I had to calculate the average velocity. I got (13, 4, -3) m/s and I have the unit vector (.934, .287, -.215). i know that vavg = deltad/deltat. The problem is that the speed is a scalar and that confuses me.