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Q: What is the average speed of a girl who takes 20 seconds to run 100 meters?

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2 metres in 100 seconds = 200 centimetres in 100 seconds = 2 cm per second.

If a mail truck takes 20 seconds to move 10 meters then the truck averages a speed of 30 meters per minute. This speed is equal to 1.8 kilometers per hour.

Your average speed is about 11 miles per hour.

The average speed is exactly 30 meters per 6 seconds. Expressed in some other units . . . -- 300 meters/minute -- 18 kilometers/hour -- 5 meters/second -- 0.005 millimeters/microsecond

Ignoring air resistance, or bouncing off the sides of the shaft on the way down ...-- Speed when you let it go = 0-- Speed after 6 seconds = 6 G = 58.84 meters per second-- Average speed = 1/2 (0 + 58.84) = 29.42 meters per second-- In 6 seconds, at an average speed of 29.42 meters per second,it fell 176.5 meters.

15 m/s

2.1

375 meters/per minute

12.5 m/s (m per seconds)

To toss a ball straight up so that it takes 4.0 seconds to return to you, it must be thrown at a speed of 19.6 meters per second. This is because it will have a speed of zero at 2.0 seconds, therefore it must have a speed of 19.6 meters per second for gravity's 9.8 meters per second squared to slow it to zero in 2 seconds.

average speed = change in displacement / change in time Speedaverage = 4000m / 5hr

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