Aspaceship moving with an initial velocity of 58.0 meters/second experiences a uniform acceleration and attains a final velocity of 153 meters/second. what distance has the spaceship covered after 12 seconds

-- The spaceship's AVERAGE speed during the acceleration is

                             (1/2) (58 m/s + 153 m/s))

                         =  (1/2) (211 m/s)

                         =      105.5 m/s  .

In 12 seconds at an average speed of 105.5 m/s,
the ship covers

                       (105.5 m/s) (12 sec)  =    1,266 meters .