At the instant the traffic light turns green, an automobile starts with a constant acceleration of 2.2m/s/s..?

Question

At the same time a truck, traveling with a constant speed of 9.5m/s, overtakes and passes the automobile. (A) How far beyond the traffic light will the automobile overtake the truck? (B)How fast will the car be traveling at that instant?

Answer 1

s=(9.5)t

s=1/2(2.2)t^2

9.5t=1.1t^2

1.1t^2-9.5t=0

t(1.1t-9.5)=0

t=9.5/1.1 or 0

cant be zero because that is when they cross the first time, and you want the second time.

s=9.5(9.5/1.1)

s=82.05m

thats A

v=v+at

v=0+(2.2)(9.5/1.1)

v=19m/s

thats B

make it a good day