1. The problem statement, all variables and given/known data An elastic powered slingshot can launch a 100 g marble into the air 18 m by using elastics. a) W hat is the average force exerted by the elastic if the elastics stretches 65.0 cm before it launches the marble? b) How fast is the marble going straight up when it is 10 m above the ground? c) W hat speed does the marble leave the sling shot? d) How high is the marble from the ground when it is moving at 10 m/s? Thanks! 2. Relevant equations 3. The attempt at a solution So i know W=Eg=mgh, but what height would i put for h? 18m or 65 cm?