Michael T. answered • 09/27/13

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To find acceleration we use the formula a=(V

_{f}-V_{i})/T where a is acceleration V_{f }is the final velocity V_{i }is the initial velocity and T is time. Since we start at 20 seconds and end at 40 seconds, the time elapsed is 40-20=20 seconds. Our initial velocity is 15,000 m/s and our final velocity is 17,500 m/s. Plugging these values into our equation, we get a=(17,500 m/s-15,000 m/s)/20 s.Our next step is to solve the subtraction in the parentheses:

a=(2,500 m/s) /20s

Next we divide:

a=125m/s

^{2}Notice that since the velocities were already expressed in terms of m/s, and we have to divide by the time, which is expressed in seconds, our final answer is expressed in terms of m/s

^{2}.
Michael T.

09/27/13