Speed = distance/time, so distance = speed X time
distance = (4.5 m/s)(10 s) = 45 meters
(Note that speed and velocity have the same magnitude but velocity includes a direction.)
When trying to solve problems like this you can get clues from the units. Since speed has units of meters per second, you can see that it is distance per time or distance divided by time. Be sure to include units with quantities and cross out units that cancel. Your answer should have appropriate units for the quantity that you're calculating. For example, the answer to this problem is in meters, a distance unit. If you don't get the correct unit then the quantity probably isn't correct either.
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