Question

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

A. 10m/s2
B. 15m/s2
C. 5m/s2
D. -15m/s2

Answer 1

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* (3s)`

`a=5m/s^2`

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

Answer 2

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

20-5 = 15

15/3 = 5