Kinematics Constant Acceleration

[anubis01]

Homework Statement

The instant the traffic light turns green a car accelerats at 3.2 m/s^2. At the same instant a truck traveling at 20m/s overtakes the car.

a) How far until the car overtakes the truck

b)How fast is the car traveling when it overtakes the truck.

Homework Equations

V_1c=o V_T=20.0 m/s
D=? D=?
a₁=3.2m/s^2 t₂=D/20
t₁=? a=0 m/s^2

The Attempt at a Solution

D₁=V₁t +1/2at^2
=0+1.6(D/20)^2
=(1.6D^2/400)
The last part is where I am stuck. I don't know how to properly square a number/number.

 

[Toftarn]

Try dividing both sides of the equation by D.

 

[anubis01]

alright I figured it out, thanks for the help. Its much appreciated.