Question: You are trying to push your stalled car. Although you apply a horizontal force of 400 N to the car, it doesn't budge, and neither

You are trying to push your stalled car. Although you apply a horizontal force of 400 N to the car, it doesn't budge, and neither do you. Which force(s) must also have a magnitude of 400 N?
(a) The force exerted by the car on you.
(b) The friction force exerted by the car on the road.
(c) The normal force exerted by the road on you.
(d) The friction force exerted by the road on you.

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