The speed of an automobile increases from 18.0 m/s to a speed of 30.0 m/s over a time period of 6.0 seconds. What is t average rate at which the speed of this car is changing (HINT: the acceleration) during this time period

Mrs. smith does her daily chores. she walks 5 m to the laundry room and then turns around and walks -14 m to the kitchen. the whole process takes her 11 minutes. what was her average velocity for these events? (choose more than 1) a. 1.48 m/s b. 0.212 m/s c. -0.136 m/s d. -0.0075 m/s