What deceleration does a passenger of a car experience if his car, which is moving at 100.0 km h^-1, hits a wall and is brought to rest in 0.1 s? Express the answer in m s^-2.

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)