A child is playing with a toy car, and it accelerates to the south from 1.2 m/s to 6.3 m/s. If the toy car's
acceleration is 2.75 m/s2, what is the amount of time
that the child takes to accelerate the car?

1.86s  

Explanation:

Given parameters:

Initial velocity  = 1.2m/s

Final velocity  = 6.3m/s

Acceleration  = 2.75m/s²  

Unknown:

Time it takes for the child to accelerate the car  = ?

Solution:

Acceleration is the rate of change of velocity with time.

   a   =  

a is the acceleration

v is the final velocity

u is the initial velocity

t is the time taken

               2.75  =  

                 5.1 = 2.75t

                 t  = 1.86s  

d

explanation:

i think the answer is d. but im not sure!

wavelength variability is the right one