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Oh, dude, that's just the "elapsed time." It's like the time that passes between the start and finish of something. So, if you're timing how long it takes to microwave a burrito, the elapsed time is how long it took from the moment you hit start to the moment you hear that glorious ding sound.
The average speed = 1/2 (initial speed + final speed) = 1/2 (15 + 25) = 1/2 (40) = 20 meters per second.The distance traveled = (average speed) x (time) = (20 x 7) = 140 meters.
This is imposible to calculate. In order to find acceleration, knowlege of at least 3 of these variables must be given: initial speed, final speed, distance, and time.
Distance = Rate X Time so, rearrange algebraically; Time = Distance/Rate = 583 meters/53 meters/s ( meters cancel ) = 11 seconds
What is the new time that Bolt ran for 100-meters