Question

driver decrease the speed of car from 25 meter per second to a 10 meter
per second in a 5 second find the acceleration of the car​

Answer 1

Answer:

-3 m/s²

Explanation:

Given :

• Initial velocity = u = 25 m/s

• Final velocity = v = 10 m/s

• Time taken = t = 5 seconds

To find :

• Acceleration of the car

Acceleration = (v-u) / t

v=10 m/s

u=25 m/s

t=5 seconds

Acceleration = (10-25)/5

Acceleration = - 15/5

Acceleration = - 3 m/s²

The acceleration of the car is equal to - 3 m/s²

Note :

• Acceleration can be found with first equation of motion also which says : V=u+at

Answer 2

Answer :

The acceleration of the car is $\bold{a=-3\ m / s^{2}}$.

The acceleration of the car is calculated using the derived formula of acceleration.

According to the question, initial velocity and final velocity is given.

Initial velocity u = 25 m/s

Final velocity v = 10 m/s

Also, time t = 5 seconds.

Therefore, we have formula of acceleration as $a=\frac{(v-u)}{t}$

Acceleration $a=\frac{(10-25)}{5}$

$\begin{array}{l}{\mathrm{a}=\left(\frac{-15}{5}\right) \mathrm{m} / \mathrm{s}^{2}} \\ {\boldsymbol{a}=-3\ \mathrm{m} / \mathrm{s}^{2}}\end{array}$