In a catapult shooting competition, an elastic band of length 
is stretched with an average force of 
.
By how many joules does the elastic energy increase when the rubber is stretched?
How much energy does the elastic band give to the pebble that is shot with the catapult when we pull it?
Which energy does the pebble have due to the energy received from the elastic band after launch and what is its value?
How much work can the pebble do when it hits an obstacle?
.
