Let's think about how speed works. Speed is a measurement of the time it takes for an object to move any distance.
The speed of vehicles in America is measured using miles per hour (MPH). What this means is that we are measuring how many miles a car can cover in an hour at it's current pace.
For example: A train moving at 100mph can cover 100 miles in a single hour. Does this make sense?
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The general relation is the following: distance = speed x time
In the case of constant speed: distance = speed x time. Or, Total distance = Average speed * Total Time
Speed=distance/time. Speed is in meters per second if distance is in meters, and time is in seconds. Using simple algebra, the equation can be rearranged to solve for a missing variable (speed, distance, or time). therefore: distance=speed x time time= distance/speed
The definition of speed: speed = distance / time. You can also write this as distance = speed x time. This is used to do various calculations related to speed. The above is actually only valid for a constant speed. If the speed changes over time, speed - or more precisely velocity - is defined (using derivatives) as v = ds/dt. However, you need to have basic notions of calculus to work with this.
They are not alike but they are related. A positive acceleration means an increase in velocity (speed). A negative acceleration means a decrease in velocity. Velocity (speed) has the dimensions of distance / time. Acceleration has the dimensions of distance/time2 or velocity/time.