Finding the magnitude of horizontal net force

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Please see the attached file.

Problem:
A 1580 kg car is traveling with a speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.0 m?

Data:
Mass of the car m = 1580 kg.
Initial Speed v0 = 15.0 m/s.
Distance s = 50 m
Required retarding force f = ?

The required retarding force f = m a ----- (1)
Where a is ...