You increase your walking speed from 1 m/s to 3 m/s in a period of 1 s. what is your acceleration? a) 2 m/s ^2 b) 3 m/s ^2 c) 5 m/s ^2 d) 4 m/s ^2

Acceleration is to change in speed divided by the time for the change. Change in speed is end speed minus started speed.  

3m/s-1m/s and equals to 2m/s.

The answer should be A. (2m/s^2.)

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The answer is A. Because 3 m/s - 1 m/s is 2 m/s In 1 s

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(x) - (y) = (1 + 4i)

(3 + 6i) - (2 + 2i) = (1 + 4i)