Question

If the acceleration of an object is negative then its velocity is also negative. Select one: O True O False

Answer 1

Answer:

False

Explanation:

Now, consider the projectile motion on a horizontal plane, then the acceleration is taken negative throughout the motion,  $a=g=-9.8ms^{-2}$ but the velocity is not necessary to be negative in this situation.

Because in this situation, the horizontal velocity does not depend on the acceleration.

$v_{x}=vcos\theta=constant$

And, the vertical velocity is also positive but decreasing.

$v_{y} = vsin\theta - gt$

Therefore, if the object's acceleration is negative then it's velocity can be positive or constant.