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OK, if a 2 Kg bird wants to drop at a rate of 1.2 m/s^2, what is the magnatude and direction of the force that the bird must exert?

(Answer is 17.2 N, but I don't understand what work to do to get it)

As for the second: If a car with a mass of 800 Kg traveling at 20 m/s slams on the breaks and comes to a complete stop after 1.5 seconds, what is the force the car feels?

(Answer is 10,667 N,but I don't understand what work to do to get it)

Any help is greatly appreciated. And if helping others doesn't make you happy, at least mastering these problems will make you feel smart.