A student films a beetle walking in a straight line without changing direction. The student chooses two frames of the recording and measures the distance the beetle moves on the screen between them and the number of frames between them. Using a known scale in the recording, the student converts the screen distance into the actual distance moved by the beetle. Using the frame rate, the student finds the time between the two chosen frames.
Which calculation gives the average speed of the beetle between the two chosen frames?
actual distance moved by the beetle divided by the time between the two frames
actual distance moved by the beetle divided by the number of frames between the two frames
time between the two frames divided by the actual distance moved by the beetle
distance moved by the beetle on the screen divided by the time between the two frames