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Let's calculate the acceleration of a car and the force required.

A car starts from rest (0 m/s) and reaches a speed of 20 m/s in 4 seconds. The car has a mass of 1200 kg.

1. Calculate the acceleration:
   Initial velocity = 0 m/s
   Final velocity = 20 m/s
   Time = 4 s
   Acceleration = (20 m/s - 0 m/s) / 4 s = 20 m/s / 4 s = 5 m/s²

2. Calculate the force needed to cause this acceleration:
   Mass = 1200 kg
   Acceleration = 5 m/s²
   Force = Mass × Acceleration = 1200 kg × 5 m/s² = 6000 Newtons (N)