Its velocity is getting smaller.
Its velocity is reducing.
Deceleration
Deceleration
no, deceleration.
acceleration or deceleration.
Retardation or negative acceleration or deceleration.
It's not possible to find speed knowing only the deceleration. Deceleration is a rate of speed decrease in time, so 90g could correspond to object slowing from 882m/s to zero in one second or, for example, an object slowing down to zero from 10m/s in 0.012 s. Deceleration during crash depends heavily on composition and general properties of objects participating.
That depends on the size, shape, and weight of the falling object, and also on its instantaneous falling speed ... that is, the rate of deceleration is not constant.
Retardation or negative acceleration or deceleration.
It is called deceleration.
It would be acceleration or deceleration, depending on whether the acceleration is greater than the deceleration or vice versa. dvA/dt = acceleration -dvD/dt = deceleration If you accelerate an object being decelerated, then the act is ( dvA - dvD )/dt
Deceleration (or negative acceleration).
car negative acceleration, also deceleration