We have this equation:
Velocity after = Initial velocity + (acceleration * time)
So, let's plug in the numbers into this equation.
98m/s = 121m/s + (acceleration * 12seconds)
So,
-23 = 12 seconds * acceleration
dividing 12 from both sides, the acc. is -1.92m/s/s. (Yes, those are the UNITs of acceleration. And it's negative because the object slows down. )
2.75 m/s
-1.92 m/s2
2.75 m/s
Average acceleration during the time interval = (change on speed) / (time for the change) =(98 - 121) / (12) = -23/12 = negative (1 and 11/12) meters per second2
B -1.92 m/s2
Using the definition of acceleration as change of speed / time, you basically need to know: * A time interval during which the object accelerates. * The velocity at the beginning of this time interval. * The velocity at the end of this time interval.
During constant acceleration, either the object's speed changes at a constant rate, or the direction of its motion changes at a constant rate, or both.
Acceleration = (speed at the end of some time interval minus speed at the beginning of the interval)/(length of the time interval)
Acceleration is equal to the change in velocity over the change in time [a=(vf-vi)/(tf-ti). a=(98m/s - 121 m/s)/(12s)=(-23m/s)/(12s)=-1.92m/s^2
Yes, acceleration is the how the velocity changes. This also includes when an object turns
Acceleration
Acceleration is a direction plus a speed. If either changes then the acceleration changes.