Question

A racing car at rest accelerates uniformly to a velocity of 144km in 20 s

Answer 1

Hey there!
Your question : A racing car at rest accelerates uniformly to a velocity of 144kmph in 20 s .Find acceleration .

Given,
Final velocity = 144kmph = 144*5/18 m/s = 40m/s


The car is initially at rest, so Initial velocity = 0 m/s .


According to Newton's laws of motion :

$\boxed { Acceleration \: = \: \frac{Final velocity - Intial velocity }{Time } }$

Now, Acceleration = 40 - 0 / 20 = 2m/s²

$\therefore$ The acceleration is 2m/s²