- #1

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The acceleration of gravity is 9.8 m/s²

**2. The attempt at a solution**

Let h = height above the ground where they pass each other.

42 - h = 6t + 4.95t²

and h = -55t + 4.95t²

Adding, 42 = -49t + 4.95t²

I don't know where to go from here. Should I use Quadratic formula to find the t? I'm confused.