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

v = 10 m/s

Explanation:

We have,

Our initial velocity is 20 m/s

Our acceleration,

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

Plugging all the known values

So, our final velocity is 10 m/s.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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