Answers

2015-06-14T18:40:51+05:30

In my opinion Speed is the only quantity that remains constant.

Distance and all the vectors ( like velocity , displacement ,acceleration , etc ) changes .

Vectors changes in each time of reference because the object changes its direction constantly.

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2015-06-14T20:28:29+05:30
For horizontal circular motion centripetal acceleration and centripetal force remains constant for a constant angular velocity 
for vertical circular motion centripetal acceleration and force keeps on changing for a constant angular velocity
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