13. student's home is 16 miles away from her work. she takes a bus that passes the first 15 miles of that distance at 30 mi/h. then she walks the last mile for half an hour. what was her average speed on the way home from work.

14. if you can throw a rock at a distance 50 m on earth, how far will it fly on the moon where acceleration due to gravity is six times less?

15. when driving on a highway at 85mi/h you notice a car pileup ahead and begins to decelerate at a maximum deceleration of 3.5 m/s^2 permitted by the brakes of your car. what distance do you need to stop the car?

16.what force is developed by 60 kg athlete when she begging to pull herself up when doing pull up exercise?

17. can a box stay motionless on a 45 degree incline with the coefficient of static friction 1.2?