dancedoll5678
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Which object is accelerating? A) A lamp standing motionless on a desk. B) A ball on a string whirled in a circle at a constant speed. C) A car driving straight along a highway at a constant speed. D) A humming bird hovering perfectly still in front of a flower.

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princessroyal
B) a ball on a string whirled in a circle

I believe the answer is B) A ball on a string whirled in a circle at a constant speed.


Acceleration indicating there is a changes to the velocity. The changes could be the total velocity or the vector/direction of the velocity. An object that moving in circular motion might have same speed, but their direction is changing constantly.

Car and humming bird in this case have no changes in their speed nor their direction.

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