• 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 non-zero.
• 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.