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In this solution the t in the y-coordinate equation is substituted using the x-coordinate equation and ultimately leads to the answer.

My questions:

1. Why don't I get the same answer when I substitute the v or v and t instead?

2. How am I supposed to know to substitute t in this example and not v?

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# Maximum range of a projectile when launched at 45°(Physics by example, Rees, pr. 14)

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