# Chapter 2 - Exercises and Problems: 48

#### Work Step by Step

We know that $v=\frac{d_x}{d_t}=4bt^3$ and we also know that the average velocity is $v=\frac{\Delta x}{\Delta t}$ $v=\frac{bt^4}{t}=bt^3$ Hence, the average velocity is one fourth of the instantaneous velocity.

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