You may want to review (Pages 75 - 82).
For help with math skills, you may want to review:
For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Different initial and final heights.
How fast should the car be traveling just as it leaves the cliff in order to just clear the river and land safely on the opposite side?
What is the speed of the car just before it lands safely on the other side?