Question

An object moving in a straight line is decelerating. Which about its acceleration is necessarily true?

Answer 1

Its acceleration is certainly negative.

Step-by-step explanation:

• When an object moving in a straight line decelerates then its velocity certainly decreases.

• Its acceleration is certainly negative.

• As we know that acceleration is the rate of change in velocity and the object is decelerating i.e. its velocity is reducing with time.

`a=(v_f-v_i)/(t_f-t_i)`

where:

`v_f\ \&\ v_i` are final and initial velocities of the object

`t_f\ \&\ t_i` are final and initial time of observation.

• Its SI unit is
  `m.s^{{-2}`