Question

correct your friend who says the car rounds the curve at a constant velocity of 70 km per hour

Answer 1

when a car rounds a curve it's velocity changes and that velocity is equal to the tangent drawn to the point.

so velocity changes it never be constant

I hope this may help you

Answer 2

Just change his statement by a word
The car rounds the curve at a constant speed of 70 km/hr
Reason- Along a curve , the direction of motion always changes.
As velocity is a vector , to be constant , it requires both magnitude and direction to be constant . Here , magnitude is constant but direction isn’t.
And speed is scalar so it requires only magnitude to be constant.
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