Q: For an object moving along a curved path at a constant speed

-its velocity is constant

-none of these

-its acceleration is zero

-its acceleration is perpendicular to its instantaneous velocity

-its acceleration vector is constant

Q: Suppose you are whirling a ball tied to the end of a string in a horizontal circle and you triple its speed.

-Its acceleration vector is constant.

-Its velocity goes up by a multiplicative factor of nine.

-Its centripetal acceleration goes up by a multiplicative factor of nine.

-None of these answers is correct.

-Its centripetal acceleration triples.

thank you!

## Error