Physiks
posted by Anonymous .
You shoot a 51g pebble straight up with a catapult whose spring constant is 320N/m. The catapult is initially stretched by 0.20m. How high above the starting point does the pebble fly? Ignore air resistance.

I did not know catapults had springs.
Try setting the potential energy stored in the spring equal to the potential energy rise at the highest elevation.
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