Question

Deceleration is ___ acceleration...explain it

Answer 1

Deceleration is negative acceleration.
Negative acceleration means that velocity is in negative. That means that the displacement is in negative.
Deceleration is also called retardation.

Hope this works!!!

Answer 2

declaration is negative acceleration .

Declaration :- a body is said to be retarded if its velocity is decreasing .
Declaration is actually acceleration with the negative sign
SI unit of declaration is -m/s^2