A glaciologist studying glaciers models the thickness \( h(t) \) of a glacier over time using the equation \( h(t) = h_0 - rt^2 \), where \( h_0 \) is the initial thickness and \( r \) is a positive constant related to melting rate. If the glacier loses 16 meters in thickness over 4 years, find the value of \( r \). - Abu Waleed Tea