According to the sources available to me a woodchuck (or groundhog) weighs about 5-13 pounds. Without adrenaline or training the average adult human male can lift 130-150 pounds, or about 90% of their body weight. Taking an optimistic estimate of 13 pounds for the groundhog, and imagining it has the dexterity and efficiency of a human person it would be able to chuck about 11.7 pounds of wood. Or 90% of 13 pounds.

The woodchuck probably wouldn't chuck very often. Without a good reason to this would be a waste of resources that would not contribute to its evolutionary fitness.
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