Aspeedboat is approaching a dock at 25 m/s (56 mph). when the dock is 150 m away, the driver begins to slow down. a) what acceleration must the boat have to come to a stop just as it arrives at the dock? b) if the braking acceleration of the boat has a maximum magnitude of 1.0 m/s^2-, how fast is the boat going when it hits the dock? convert your result to mph. c) if the braking acceleration of the boat has a maximum magnitude of 1.0 m/s^2, at what distance from the dock should the driver have begun slowing down?