ANSWERS: 4

No. average speed = total bicycle distance travelled divided by total time. If average speed is zero, total bicycle distance travelled must be zero. bicycle never moved.

No, but it could have an average velocity of zero. Consider a particle making one complete revolution of a circular path. When it returns to its starting point: Average speed = total distance / total time = circumference of circle / time taken. Average velocity = total displacement / total time = 0 / time taken = 0. Displacement is zero as the particle finishes back at the same point at which it started; there is no net change in position. Hence average velocity is also zero, although speed is nonzero.

No This Q illustrates the difference between average Speed and Average Velocity If you run a mile in 10 minutes, but returned to where you started from your average velocity would be 0. This is do to the fact you're net distance traveled is 0 and average velocity is just displacement divided by time. So, 0km/10 min= 0km per minute However, Average speed is a measure of the distance traveled in a given period of time; it is sometimes referred to as the distance per time ratio. Average speed is not determined by displacement just total distance traveled So, 1km/10 min= 0.1km per minute

Speed, no, you cant have a negative speed, so it would always have to be 0. But if the question says velocity, then yes, because velocity includes a direction. You could walk to the right for 5 seconds at 2m/s then left for 5 seconds at 2m/s and the average velocity would be 0, yet you traveled a distance.
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