Question

A driver decreases the speed of a car from 25m/s to 10m/s in 5sec .find the acceleration of the car

Answer 1

hope this help you......

Answer 2

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

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