A 48 kg dog is loaded onto the trunk of Michael Jordan's car, and the he speeds away without the dog sliding. If the coefficient of static friction between the trunk and the dog is 0.4, what is the maximum acceleration that the car can undergo without the dog slipping? Put your answer in a whole number without a unit.

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?