Question

A plane is cruising at 155.00 km/h increases it speed to 285.1 km/h in just 11.5 s as it makes a dive. What was the acceleration of the plane?

a = vf - vi / t
Your equation needs brackets aroun vf - vi.

vf = 285.1km/h
vi = 155.0 km/h
t = 11.5 s

Plug them into your equation and solve for a.
Prior to subbing speeds into your equation, make sure you first convert km/h to m/s.

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