A car accelerates in the +x direction from rest with a constant acceleration o a₁ = 1.88 m/s² for t₁ = 20 s. At that point the driver notices a tree limb that has fallen on the road and brakes hard with a constant acceleration of a₂ = -6.01 m/s². Write an expression for the car's speed just before the driver begins braking, v₁.
