1. The problem statement, all variables and given/known data You shoot a 57 g pebble straight up with a catapult whose spring constant is 310 N/m. The catapult is initially stretched by 0.30 m. How high above the starting point does the pebble fly? Ignore air resistance. _____ m 2. Relevant equations ???? 3. The attempt at a solution I am totally lost...this incorporates gravity and the spring...and ah...my head hurts...any one help?