(adsbygoogle = window.adsbygoogle || []).push({});

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?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

**Physics Forums | Science Articles, Homework Help, Discussion**