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# I really need help.

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Find the acceleration for an airliner that takes 20.0 seconds to increase its velocity from a standing start to 80.0 m/s (179 mph) during takeoff.

Feb 1, 2019

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acceleration is    change in speed/time      = 80m/s divided by 20sec

$$= \frac{80m}{sec}\times \frac{1}{20sec}\\ =\frac{80m}{sec*20sec}\\ =\frac{4m}{sec^2}\\ =4m/s^2$$

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Feb 1, 2019