Timmy weighs 50 kg and leaves home walking east at 3.18 m/s. Dave is drunk, weighs 75 kg and is driving a 1989 Ford pickup, its bed filled with dead mice. He starts speeding southbound at 120 km/h. At precisely 9:08 AM, Timmy starts to cross Weldon street and is struck and killed by Dave's pickup. Dave hides Timmy's battered, broken corpse under a pile of dead mice and dumps it in the river.

What is Timmy's southbound acceleration imparted by the pickup truck at the moment of impact?