In the formula v=u+at, if a=5m//s^(2),t=...

In the formula v=u+at, if `a=5m//s^(2),t=3` seconds and `v=20m//s,` then u=____.

10m/s

6 m/s

7 m/s

5 m/s

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The correct Answer is:

make u as the sujbect in the formula and evaluate u.

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