Rearranging equations
Inverse operations isolate an unknown in a physical equation.
Guess first. It doesn't count.
A cart travels 120 meters at a steady 6 meters per second. How long does it travel?
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What you'll learn3 ideas
- Doing the same operation to both sides of an equation keeps the equality true.
- At a steady nonzero speed, travel time equals distance divided by speed: $t = d/v$.
- For a cart speeding up at a constant rate, acceleration equals the change in speed divided by the nonzero time: $a = (v-u)/t$.