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Re: Rate of change problem
Think about what that rate represents:
At the start t = 0 and V = 0. At the end V = 15 at (say) t = T
So integrate to get V in terms of t; put V = 15 (the constant of integration will come from t = V = 0) and solve for T
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei