Question

I keep getting 88 for the answer for the time but it says 96 is the correct answer what am i doing wrong?

1.1-D Kinematics: New Computational Problem (v1)-

A UFO experienced a constant acceleration of 16 m/s² north during which its displacement was 67,584 m north and was going 1472 m/s north at the end of said acceleration. Determine how long the UFO was accelerating & the initial speed of the UFO. NOTE: Initially the UFO was going south.

Δt = 88

96 s

v_i =   

64 m/s

Answer 1

Using motion equation

it is going in south hence

then

and initial speed is v=64m/s