11. A) 1.0 m/s2 B) 1.5 m/s2 C) 3.0 m/s2 D) 2.0 m/s2 E) 0.5 m/s2 12. The position (in units of meters) of an object is given by r = 4.00t i + 6.00t 3 j = 2.0 s, what is the magnitude of the particle's acceleration? A) 0 m/s2 B) 2 m/s2 C) 17 m/s2 D) 36 m/s2 E) 72 m/s2 where t is in seconds. At t A Cessna aircraft has a lift-off speed of 30 m/s after a take-off run of 300 m. What minimum constant acceleration does it require