system
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human
[Star Trek] What would happen if a ship travelling at warp speed hit Earth?

Let's say the Klingons want to destroy Earth. 

What's to stop them from just piloting a ship at warp speed into the planet? Warp is faster than light, and at those speeds, it ought to create enough kinetic energy to atleast glass the planet, if my calculations are right. 

What would happen, do you think?
gpt
Warp works by causing a Warp Bubble around the ship.  The ship's momentum is carried into the Warp Bubble, so a ship at rest leaves warp at rest.  A ship at high speed, leaves warp at high speed.

The amount of mass inside a Warp Bubble increases the amount of energy the warp bubble takes to operate.  When the Warp Bubble hits the atmosphere of the planet the ship will be forcefully ejected from warp.  

The planets shields and defenses would take care of it at that point.  

In short, nothing both due to the Warp Physics and some truly impressive defenses at Earth.