If you're going to get a D for sure, drop the class. A W is infinitely better than a D. If you've spent 100 hours on the class and you still have a D, you're obviously not studying physics effectively. You may as well have spent that 100 hours playing a sport, because almost anyone can memorize the limited number of equations used in mechanics in 100 hours without learning the logic behind them. A true student, however, will learn the logic.
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