Amtrak's 20th-Century Limited is en route from Chicago to New York at 120 km/h when the engineer spots a cow on the track. The train brakes to a halt in 1.3 min, stopping just in front of the cow.
a) What is the magnitude of the train's acceleration?
Express your answer to two significant figures and include the appropriate unit
b) What's the direction of the acceleration eastward or westward?
c) How far was the train from the cow when the engineer first applied the brakes Express your answer to two significant figures and include the appropriate units.



10. You and your roommate plot to drop water balloons on students entering your dorm. Your window is 10 mm above the sidewalk. You plan to place an X on the sidewalk to mark the spot a student must be when you drop the balloon. You note that most students approach the dorm at about 2 m/s.
a) How far from the impact point do you place the X?
Express your answer to one significant figure and include the appropriate units.