Giulia unreels her kite string until the kite is flying on a string of length 50 m. a light breeze holds the kite such that the string makes an angle of 60° with the ground. after a few minutes, the wind picks up speed. the wind now pushes the kite until the string makes an angle of 45° with the ground. what distance has the kite changed position horizontally over the ground. determine an exact expression.