1. ideally speaking. how much power does it take a power lifter to lift 317 lbs 0.90-m of the ground in 3.3 seconds? 2. ideally speaking. how much power does it take a power lifter to lift 350 lbs 0.57-m of the ground in 3.3 seconds? 3. determine the kinetic energy done by a racquetball (40.0-gram) traveling at 175-mph 4. an ornament of mass 27.3 g is attached to a vertical ideal spring with a force constant (spring constant) of 40.8 N/m. The ornament is then lowered very slowly until the spring stops stretching. How much does the spring stretch? 5. If the initial height of a rock is y1=h=4.7 calculate the rocks velocity when it has fallen to 2.5m above the ground 6. how much net work is required to accelerate a 1016-kg car from 18 m/s to 46 m/s? 7. assuming the height of a hill is 48m, and the roller-coaster car starts from rest at the top, at what height will the coaster have 0.39 times it's original speed 8. determine the kinetic energy done by a hockey puck (191 gram) traveling at 97.3mph