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:

the average speed is 24.57 km/hr

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.