Answer:
First, deceleration is the rate at which the speeds decreases, and it can be calculated as:
d = -(vf - v0)/t
where vf is the final velocity, v0 is the initial velocity, and t is the lapse of time.
Is easy to see that the units are distance/(time squared)
So any measure that has different units is not a measure of deceleration.
For example, the measure of the speed in a given direction is not a measure of deceleration.
The measure of how fast something rotates is not a mesure of deceleration (this has the same units, but this would be related to the centripetal acceleration)
The measure of the weight of someting is not a measure of deceleration.
