A camera is packed in a box and surrounded by packing material. The box is dropped vertically onto a horizontal surface. The vertical velocity of the box at the time that it hits the surface is v= 5m/s. After impact the camera experiences an acceleration of a = -kx, where k is a constant and x is the compression of the packing material. If the packing material experiences a maximum compression of 30 mm, determine the maximum acceleration of the camera.