Arunner traveling with an initial velocity of 4.0 m/s accelerates at a rate of 6.0 m/s^2 for a time of 3.0 seconds what is the velocity at the end of this time?

This problem can be solved using the 1D dynamics equation, V = Vo + at, where Vo is the initial velocity, a is the acceleration, t is the time, and V is the final velocity at the end of that time. We have Vo = 4m/s, a=6m/s^2, t=3s, so you simply solve for V. 

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So since the snail is moving at 3.6  miles per hour you multiply by 5280 to change it into feet per hour. so you get 36*528 ft per hour. since there are 3600 seconds in an hour, you divide 36*528 by 3600. so simplifying we get 528/100 which is 5.28 ft per second