Question

ball|distance traveled (cm)|time taken to cover the distance (seconds)
ball 1|100|10
ball 2|50|20
ball 3|100|20
ball 4|50|10
which ball is moving with the fastest speed?

Explanation:

Step1: Recall speed formula

Speed $v=\frac{d}{t}$, where $d$ is distance and $t$ is time.

Step2: Calculate speed of Ball 1

$v_1=\frac{100}{10}=10$ cm/s

Step3: Calculate speed of Ball 2

$v_2=\frac{50}{20}=2.5$ cm/s

Step4: Calculate speed of Ball 3

$v_3=\frac{100}{20}=5$ cm/s

Step5: Calculate speed of Ball 4

$v_4=\frac{50}{10}=5$ cm/s

Answer:

Ball 1