A slingshot obeying Hooke's law is used to launch pebbles vertically into the air. You observe that if you pull a pebble back 18.2 cm against the elastic band, the pebble goes 5.0 m high.
Part A How far must you pull it back so it will reach 10.0 m? Express your answer to three significant figures and include the appropriate units.
Part B If you pull a pebble that is twice as heavy back 18.2 cm, how high will it go? Express your answer to two significant figures and include the appropriate units.