Atrain increase its speed steadily from 10m/s to 20m/s in 1minutes a what is the average speed during this time in m/s b how far does it travel while increasing its speed

If it increased its speed steadily at a constant rate, then the average speed for the minute was

(1/2)(10m/s + 20m/s) = 15 m/s .

Rolling at an average speed of 15 m/s for 1 minute (60 seconds), it travels

(15 m/s) (60 sec) = 900 meters

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