Answer the following grade 12 physics questions.

11. A ball rolls on a frictionless horizontal surface with a constant acceleration of 2 m/s' . [5 marks] If the ball starts from rest, a) What is the velocity of the ball after 4 seconds? b) How far did the ball travel? 12. A paintball leaves the muzzle of a gun with a velocity of 400 m/s. The length of the gun barrel is 50 cm. (6 marks] a) How long is the bullet in the gun after being fired? b) Assuming the bullet is uniformly accelerated, what is the bullets average velocity inside the barrel? 13. A car leaves point A and drives at 60 km/hr [40 W of N]. The car then heads north at 30 km/hr arriving at point B. If the entire trip lasts 3 hours, determine the cars acceleration during the trip from A to B. [6 marks]