How does inertia explain why it is difficult to stop a moving
skateboard?

(Example Person) has to push hard to get the skateboard started, but once it begins moving, it takes much less effort to keep it rolling over the smooth, flat pavement. In fact, if (Example Person) tries to stop the rolling skateboard, it may take as much effort to stop it as it did to start it rolling in the first place.

Explanation:

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12000j is work done

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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