Question

if initial velocity of a moving car is 30 m/s and its final velocity is 60 m/s, what is its average velocity?
a 90 m/s
b 30 m/s
c 15 m/s
d 45 m/s

Explanation:

Step1: Recall the formula for average velocity

The formula for average velocity \(v_{avg}\) when initial velocity \(u\) and final velocity \(v\) are given (for uniformly - accelerated motion) is \(v_{avg}=\frac{u + v}{2}\).

Step2: Substitute the given values

Here, \(u = 30\ m/s\) and \(v=60\ m/s\). Substitute these values into the formula: \(v_{avg}=\frac{30 + 60}{2}\).

Step3: Calculate the result

First, add the numerator: \(30+60 = 90\). Then divide by 2: \(\frac{90}{2}=45\ m/s\).

Answer:

D. \(45\ m/s\)