An object moving with constant acceleration changes its speed from 20 m/s to 60 m/s in 2.0 s. what is the acceleration? (b) how far did it move in this time?

acceleration, a =

distance, d = 80 m

Given:

Initial velocity of object, v = 20 m/s

Final velocity of object, v' = 60 m/s

Time interval,

Solution:

(a) Acceleration is the rate at which velocity changes and constant acceleration is when the velocity changes by equal amount in equal intervals of time.

Thus

acceleration, a =

a =

(b) Now, the distance covered is  given by:

that would be because of both gravity and friction. so     c