D = vo t - at²/2 v = vo - at 40 m = vo · 7.10 - a · ( 7.10 )²/2 40 m = 7.10 vo - a· 50.41/2 40 m = 7.10 vo - 25.205 a 2.75 m/s = vo - 7.10 a ⇒ a = ( vo - 2.75 )/ 7.10 40 = 7.10 vo - 25.205 · ( vo - 2.75 ) / 7.10 40 = 7.1 vo - 3.55 vo + 9.7625 3.55 vo = 30.2375 vo = 30.2375 : 3.55 = 8.5176 m/s Answer: the truck`s original speed is 8.5176 m/s.
Because the car is moving up and the bug is moving down. but it also depends on the weather so choice between one of those two I think is Negative but I may be wrong.
