First slide

Rectilinear Motion

Question

A car is decelerating from 20 m/s to rest in 10S. Determine its acceleration

Easy

A

$2 m / s^{2}$
B

$- 2 m / s^{2}$
C

$4 m / s^{2}$
D

$1 m / s^{2}$

Solution

Initial velocity $u = 20 m / s$
Final velocity $V = 0 m / s$
Time taken $t = 10 S$
$∴$ acceleration $a = \frac{V - u}{t}$
$\begin{array}{l} = \frac{0 - 20}{10} = \frac{- 20}{10} \\ = - 2 m / s^{2} \end{array}$

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