**What is rate of change?**

It refers to the change of a physical quantity with time. One good example is speed.

Speed is the change in distance per unit time. If we let distance be

*s*, and let time be*t*. In Mathematical terms, the rate of change of*s*with respect to*t*can be written as:
What is the units of

*ds/dt*? Since distance,*s,*has a unit of metre, and time,*t*, has a unit of seconds, then*ds/dt*has units of*m/s*.**Chain Rule**

If you know the rate of change of

*x*with time (*dx/dt*),and need to find the rate of change of*V*with time (dV/dt), you need an equation with*V*and*x*, and subsequently differentiate it to find*dV/dx*. Using the following equation,*dV/dt*can be found.
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