To calculate the distances traveled during different time intervals, we need to determine the average velocity and use it to calculate the distance. The object is standing still when its velocity is zero.
In order to determine the distance traveled by the object during each 5-second interval, we need to calculate the average velocity of the object during that time and then multiply it by 5 seconds.
For the first 5 seconds (1 to 5 s), we can use the formula distance = average velocity * time. Since the object is in free fall, its initial velocity is 0 m/s and its final velocity can be determined using the formula final velocity = initial velocity + acceleration * time. The acceleration due to gravity is approximately 9.8 m/s2. By substituting the values into the formula, we can find the final velocity and then calculate the distance traveled during the first 5 seconds.
The same calculation can be done for the other intervals (5 to 10 s, 10 to 15 s, 15 to 20 s) by using the final velocity from the previous interval as the initial velocity for the next interval.
Finally, to find the distance traveled during the last 10 seconds (20 to 30 s), we can calculate the final velocity at 20 seconds and then use that value to calculate the distance traveled during the last 10 seconds.
The object is standing still during the time interval when its velocity is zero. By analyzing the final velocity at the end of each interval, we can determine when the object is standing still.