1When does speed becomes velocity?
A.when it is high
B.when it is low
C.when it is accompanied by direction
D.when it is without direction
2.which description indicates the fastest runner.?
A.the runner with the longest recorder time
B.the runner with the farthest distance travelled
C.the runner with the farthest distance travelled in the longest time
D.the runner with the farthest distance travelled in the shortest time.

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