Question

A car at accelerates from 0 m/s to 25 m/s in 5 seconds. What is the average acceleration of the car? A. 30 m/s2 B. 50 m/s2 C. 125 m/s2 D. 5 m/s2​

Answer 1

Given,

A particular car accelerates from 0m/s to 25 m/s in a total of 5 seconds.

To Find,

The average acceleration of the car.

Solution,

We know that Average acceleration = (Final velocity - initial velocity)×$\frac{1}{Time}$.

So here Final velocity = 25m/s .

Initial velocity = 0m/s

Total time = 5 seconds.

So average acceleration = $\frac{25-0}{5}$=$\frac{25}{5}$ m/s =5 m/s .

Hence, the average acceleration of the car is 5 m/s.

Answer 2

Given:

A car accelerates from 0 m/s to 25 m/s in 5 seconds.

To Find:

The average acceleration of a car?

Step-by-step explanation:

• Average acceleration is the ratio of change in velocity to the change in time.

• From the question given values are as follows.

        The initial velocity of car    $(v_i)$     =   0 m/s.

         final velocity of car  $(v_f)$              =  25 m/s.

         initial time     $(t_i)$                           = 0 second.

         final time       $(t_f)$                          = 5 second.

• Average acceleration is given by the following formula.

                       $\textrm{Average acceleration}= \frac{v_f-v_i}{t_f-t_i}$

• Put all the values in the formula of average acceleration.

                        $\textrm{Average acceleration}= \frac{(25-0)m/s}{(5-0)s}$

                                                          $=\frac{25}{5}$

                                                          $=5m/s^2$.

Thus, the average acceleration of car is    $5m/s^2$.

Option D is the correct answer.