Question

If we have a velocity of 20 m/s and our acceleration is -5 m/s, then after 2 seconds our velocity will be....

a) 15 m/s
b) 40 m
c) 10 m/s
d) -10 m/s

Answer 1

v = 10 m/s

Step-by-step explanation:

We have,

Our initial velocity is 20 m/s

Our acceleration,
`a=-5\ m/s^2`

It is required to find the velocity after 2 seconds. It is a concept based on equation of kinematics. Using first equation:

`v=u+at`

Plugging all the known values

`v=20+(-5)(2)\\\\v=10\ m/s`

So, our final velocity is 10 m/s.