D Question 15 A ball is thrown straight up in the air. At the top of its path, its instantaneous speed is ... O 9.8 m/s 0 0 m/s 0 5 m/s O 9.8 m/s2 pointing downwards D Question 16 A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's acceleration? 0 9.8 m/s2 1.67 m/s2 O 0.17 m/s2 6 m/s2