If you are asked to determine an object’s speed, what information must you have?
A.distance and period of time
B.distance and change in position
C.period of time and direction
D.distance and direction
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raffa w
To determine an object's speed, you need two key pieces of information: distance and time.
The correct option is A: distance and period of time.
To find the speed of an object, you need to measure the distance it travels and the time it takes to cover that distance. The distance can be measured in units such as meters or kilometers, while the time can be measured in seconds, minutes, or hours. By dividing the distance traveled by the time taken, you can calculate the object's speed.
Option B (distance and change in position) is not sufficient to determine speed because knowing the change in position does not provide information about the time taken to cover that distance.
Option C (period of time and direction) is incorrect because direction is not required to calculate speed. Speed is a scalar quantity, meaning it only has magnitude and not direction.
Option D (distance and direction) is incorrect because, as mentioned before, direction is not necessary to calculate speed. So, the correct answer is A: distance and period of time.