15:3 is the only equivalent ratio to 20:4.
Step-by-step explanation:
3 to the power of 5
3^5
= 3x3x3x3x3
= 243
For this case we have the following equation:

Where, we have the following variables:
x: time in seconds
y: speed in feet per seconds
For the initial velocity, we evaluate x = 0 in the given equation:

Therefore, the initial speed is 12 feet per second.
Answer:
The particle's initially velocity is 12.
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