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taskmasters
If your speed changes from 10 km/h to 6 km/h, you have a negative acceleration. The correct option among all the options that are given in the question is the first option or option "a". The other choices are totally incorrect. I hope that this is the answer that has actually come to your help.
facundo3141592

Answer: So if your speed changes from 10 km/h to 6 km/h, this means that you are des accelerating, so your velocity is decreasing. This will happen only if your acceleration is negative.

If your acceleration is positive, your velocity will increase, if your acceleration is neutral, then your velocity will be constant. If your acceleration is oscillating, then your velocity will decrease, then increase, then decrease, and so on.

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