40 points. asap. will give brainliest displacement vectors of 3 m and 5 m in the same direction combine to make a displacement vector that is 2m 0m 8m 15m average speed is the total distance divided by the average distance average acceleration total time slope the rate at which volocity is changing at a given instant is described by instantaneous acceleration average speed constant speed vector addition a train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 seconds. how can the train's acceleration be described? the train's acceleratipon is positive the train is not accelerating the train will come to rest in 6 minutes the train's acceleration in negative when a pair of balanced forces acts on an object, the net force that results is greater in size than both forces combined greater in size than one of the forces equal in size to one of the forces equal to zero