Reference article
Apple (Duck Life 9: The Flock)
Eat this in a race to increase your energy!
Obtaining
Talk to 
Spike in 
Spring Meadows; he gives you your first Apple. To buy more, complete 5 
Mallard Smuggler Tasks for Platy to unlock this item in the Smuggler’s Shop. Buy it for 
100 each.
Using it
Restore race energy equal to the amount spent on one Cheer. The item is consumed when used; it does not raise the duck’s permanent Energy level. Select its ability button during a race when it is ready. Each activation uses one item from your bag.