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Acceleration of stalled vehicle

Two people pushing a stalled car. The mass of the car is in kilogram, kg. One person applies a force of in newton, N to the car, while the other applies a force of N. Both forces act in the same direction. A third force of N also acts on the car, but in a direction opposite to that in which the two people are pushing. This third force is due to the road frictional force.
Find the acceleration in meter/sec² of the car. , Answer

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