The spacecraft S approaches the planet Mars along a trajectory b-b in the orbital plane of Mars with an absolute velocity of 16.3 km/s. Mars has a velocity of 23.0 km/s along its trajectory a-a. Determine the angle β between the line of sight S-M and the trajectory b-b when Mars appears from the spacecraft to be approaching it head on.

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Q: 450 45°

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.