Question

the speed of the truck changes from 20m/s to 5m/s in 20s due to the application of brakes. find its acceleration​

Answer 1

Answer:

acceleration = -0. 75

Explanation:

u=20 v=5 t=20 a=x from formula v=u+at we get 5-20÷20 = -0.75 here minus indicates retardation

Answer 2

Answer:

a= 0.75m/s²

Explanation:

u= 20m/s

v= 5m/s

t= 5s

Therefore, v - u

a= -----------

t

5-20

= -----------

5

-15

= ------

5

=-5m/s²