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One of my hw problems:

A motorcycle has a constant acceleration of 2.5 m/s2. Both the velocity and acceleration of the motocycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 21 to 31 m/s, and (b) 51 to 61 m/s?

Could somebody please help me work through this problem? I really just don't. know. what. to. do.

:( gwyneth