Question

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

Answer 1

Answer:

Its acceleration is certainly negative.

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.

$a=\frac{v_f-v_i}{t_f-t_i}$

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 $m.s^{{-2}$