Question

The velocity of a car teduces from 30 km/h as the car approaches a stop sigh. Is this an example of positive or negative accelerationthe

Answer 1

The stopping car has negative acceleration.

Step-by-step explanation:

We know acceleration is the rate of change of velocity. That is

Acceleration(a) = ( Final velocity - Initial velocity )/ Time taken.

Here Final velocity = 0 km/h( car stops) and initial velocity = 30 km/h

So acceleration = (0-30)/time = -30/ time

Time is always positive , so -30/time is negative, so the stopping car has negative acceleration.