The two measurements necessary for calculating average speed are
a) acceleration and time.
b) velocity and time.
c) distance and time.
d) distance and acceleration.
e) velocity and distance.

The correct answer is Option (C) distance and time

Explanation:

Average speed of any object is defined as the total distance that object travels over the time it takes to travel that distance. In other words, average speed is the total distance divided by the elapsed time.

Therefore, as you can see in the above equation, the two measurements that are essential for the calculation of the average speed are the (total) distance and the (elapsed) time.

Hence, the correct option is C.

measuring things 1 litre of water