Not much, I would say about a snickers worth.
Heres how...
1. Eat Snickers.
2. Feel Satisfied
3. Unwrap Solar Sail.
4. Wrap Squirrel in Solar Sail into a soccer shaped ball.
5. Punt Squirrel.
6. Measure Distance.
7. Call and report your findings to PETA.
8. Eat another Snickers.
Well 1 snickers contains roughly 1.1 megajoules. Say the squirrel weighs roughly 250 grams - I've never had the compunction to capture and weigh one - which would mean it would take 2.45 joules of energy to lift it 1 meter against Earths gravity.
With the low end of human muscle efficiency in the conversion of energy into power. Ideally you'd be able to fire the little beastie ~63km off the energy of a snickers.
1. Eat Snickers. 2. Feel Satisfied 3. Unwrap Solar Sail. 4. Wrap Squirrel in Solar Sail into a soccer shaped ball. 5. Punt Squirrel. 6. Measure Distance. 7. Call and report your findings to PETA. 8. Eat another Snickers.