Bouncing ball animation with squash and stretch
Step1
On layer1 Create a filled circle on frame1 & Rename layer1 to ball.
Step2
Convert the circle to a symbol called "ball".
Step3
Create a guide layer by clicking on add motion guide, this will create a guide layer for the ball layer
Step4
Select frame 1 on the guide layer and draw the path that you want your ball to travel along using the pen tool. Make sure you are on the guide layer
Step5
Add a key frame using F6 on frame 30 for both layers
Step6
On frame1 of the ball layer drag the symbol called ball and centre it at the beginning of the line
Step7
on frame 30 repeat the last step
Step8
Click on frame1 of the ball layer and go to properties and select motion tween
your frames should go blue with an arrow between key frames 1-30
Step9
Move the timeline back and forth to see the animation
now you can tune the animation to make the motion more realistic
Step10
"Squash and stretch" insert three frames where your ball bounces and squash the ball on the middle one using the transform tool.
Step11
Repeat this wherever the ball bounces
Step12
Your keyframe pattern should look something like this
when you are finished try to work out how you could create a shadow