Question

You are driving a metric car that has a speedometer that displays in meters per second. When you look down at your speedometer, you see that it reads 19.9 m/s, then 47.6 s later you look down and it reads 4.4 m/s. What is your average acceleration over those 47.6 s?

Answer 1

Answer:

0.33m/s²

Explanation:

Given parameters:

Initial velocity  = 19.9m/s

Final velocity  = 4.4m/s

Time  = 47.6s

Unknown:

Acceleration  = ?

Solution:

To solve this problem, we use the expression below:

     Acceleration  = $\frac{v - u }{t}$

v is the final velocity

u is the initial velocity

 t is the time taken

    Acceleration  = $\frac{4.4 - 19.9}{47.6}$  

    Acceleration = -0.33m/s²

This is a deceleration