Slowly press on the accelerator to go more quickly. Slowly press down on the brake pedal to go more slowly. These two operations can safely change a car's velocity.
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Acceleration = Change in Velocity / Change in Time a = (Final Velocity - Initial Velocity) / (Final Time - Initial Time) = (55-0)/(5-0) = 55/5 a = 11 m/s^2
Acceleration = (change in velocity) divided by (time for the change)
It equals an undefined entity. The average acceleration of an object equals the CHANGE in velocity divided by the time interval. The term "change in velocity" is not the same as the term "velocity", "average velocity", or "instantaneous velocity".
(change in velocity)/(change in time)=avg. acceleration (-30 m/s)/(15s)= -2 m/s2
The rate of change of position is the velocity. The velocity at a specific point in time is called the instantaneous velocity.