When an object moves in a variable speed straight line, the distance it passes in the first second is 3M, the distance it passes in the second second is 5m, and the distance it passes in the first three seconds is 15m, then what is its average speed in the first second, the average speed in the first two seconds, and the average speed in the third seconds?

When an object moves in a variable speed straight line, the distance it passes in the first second is 3M, the distance it passes in the second second is 5m, and the distance it passes in the first three seconds is 15m, then what is its average speed in the first second, the average speed in the first two seconds, and the average speed in the third seconds?

The average velocity in the first second is V1 = 3 / 1m / S = 3m / s
The average velocity in the first two seconds V2 = (3 + 5) / 2m / S = 4m / S
Average velocity V3 = (15-5-3) / 1 m / S = 7 m / s in the third second