Question

1. if a vehicle changes its velocity from 30 m/s to 20 m/s in 5 seconds, what is the acceleration?

○ 1 m/s²
○ -2 m/s²
○ 25 m/s²
○ -5 m/s

Explanation:

Step1: Identify initial and final velocity and time

Initial velocity $u = 30\ m/s$, final velocity $v=20\ m/s$, time $t = 5\ s$.

Step2: Use acceleration formula

The formula for acceleration $a=\frac{v - u}{t}$. Substitute the values: $a=\frac{20 - 30}{5}$.

Step3: Calculate the acceleration

$a=\frac{- 10}{5}=-2\ m/s^{2}$.

Answer:

B. -2 m/s²