Answers

2015-08-31T21:32:43+05:30
The car rounded the curve at a constant SPEED of 70 km/h
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2015-08-31T21:36:48+05:30
The car covered the curve at a constant velocity of 70 km/h.
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I hope it may help you. :)
A body moving in a curved path doesn't have constant velocity
You're right. I also think.
But the direction changing continuously na. Now more confusion.