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Thread: Use Algebra to solve

  1. #1
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    Use Algebra to solve

    Use Algebra to solve $\displaystyle v_2$ = $\displaystyle v_1$ + $\displaystyle at$ for $\displaystyle v_1$ if $\displaystyle v_2$ = 245m/s, a= 19m/s squared, and t = 22s

    I just want to be put on the right track... now I seen many examples for this online. I just am primiarily confused because of the units of time and speed.
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  2. #2
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    Re: Use Algebra to solve

    In solving for $\displaystyle v_1$, you can ignore the units. Units are useful to check that expressions that you are evaluating make physical sense, but they don't contribute to the numerical answer.

    Start by subtracting $\displaystyle at$ from both sides of the equation.
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  3. #3
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    Re: Use Algebra to solve

    Thank you very much. I figured it out and it was right, I made it harder than it should of been.
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