Question

What is a car's acceleration if it increases its speed from 5 m/s to 20 m/s in 3 s?

Answer 1

the correct answer would be C. 5m/s^2

20-5 = 15

15/3 = 5

Answer 2

Answer : The acceleration of the car is, $5m/s^2$

Explanation :

By the 1st equation of motion,

$v=u+at$ ...........(1)

where,

v = final velocity = 20 m/s

u = initial velocity  = 5 m/s

t = time = 3 s

a = acceleration of the car = ?

Now put all the given values in the above equation 1, we get:

$20m/s=5m/s+a\times (3s)$

$a=5m/s^2$

Therefore, the acceleration of the car is, $5m/s^2$