Question

what information must a person have if they are asked to determine an objects speed?
distance and direction
distance and change in position
distance and period of time
period of time and direction

Explanation:

Speed is calculated as \( speed=\frac{distance}{time} \). So, to find speed, one needs distance (how far the object has traveled) and period of time (how long it took to travel that distance). Direction is related to velocity (a vector quantity), not speed (a scalar quantity). Change in position is also related to velocity (as it involves displacement). So the key information for speed is distance and period of time.

Answer:

C. distance and period of time