A car travels around a horizontal circular driveway at a constant speed of 4 m/s. Which one of the following statements is correct? 1.) The car's acceleration is zero. 2.)The car's velocity is constant but not zero. 3.)The car's acceleration is not zero. 4.)The car's position vector relative to a fixed origin is constant. 5.)The car's velocity is zero.
Time rate of change of displacement is known as velocity. The velocity is a vector quantity. It is a combination of speed and direction.
Acceleration is defined as time rate of change in velocity of an object. Since velocity is combination of speed and direction, the change in direction or speed is called as acceleration.
In the case of circular motion, the direction continuously changes, so, it has acceleration, which is called as centripetal acceleration towards the center of the circle.
In circular motion, the car position is fixed and equal to radius of the circle.
So, the correct statements are:
2) The car's velocity is constant but not zero.
3.) The car's acceleration is not zero
4.) The car's position vector relative to a fixed origin is constant
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