# Mutual Gravity I - Warmup!

**Classical Mechanics**Level 1

Two Spherical Objects of

**attracts themselves for their***Mass, M***Mutual Gravitation**from a*Distance, d*One of them is *still* ( not moving ) , another is *orbiting* the first one. Which means first one is at the ** Focus** of the second one's orbit.

So, what's the **Orbiting Speed** of the second object?

**Data:**

- \[\text{M}=1\times 10^{12}kg\]
- \[d=66.73m\]
- \[\text{G}=6.673\times 10^{-11} \text{N}m^2kg^{-2} \]

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