Now I think I got it.
The tractor is at full stop when the collision happens, and the car is driving with a speed of 4m/s.
I might have done it in a messy way, do you guys have a faster way to do the problem?
First i solved for t, and i got that the car stops after 4.44s and the tractor after...
A tractor and a Tesla drives in opposite directions. The tractor has a speed of 40.0km/h and the car has a speed of 80.0 km/h. The Tesla suddenly sees the tractor, and they both immediately start braking, both with constant accelerations of 5.00 m/s2 (opposite to their directions of motion)...