Exercise 1.5: Gaussian Random Walk
Exercise 1.6: Custom Probability Distribution
Merge conflict
Exercise 1.5: Press up and down
Example 1.9: Motion 101(velocity and random acceleration)
Exercise 1.6: Accelerating by Perlin Noise
Example 1.10: Accelerating towards the mouse
Exercise 2.2: static applyForce
Example 2.1: Forces
Example 2.2: Forces acting on many objects
Example 2.3: Gravity scaled by mass