Fatty acids: Are long-chain carboxylic acids. Palmitic acid (C) and arachidonic acid (B) are examples of fatty acids.
Amino acids: Glutamic acid (A) and aspartic acid (E) are amino acids, the building blocks of proteins. They are not fatty acids.
Phospholipid: Lecithin (D) is a type of phospholipid, a major component of cell membranes. While fatty acids are part of the structure of lecithin, lecithin itself is not a fatty acid.
Thus, the compounds that are not fatty acids are A, D, and E.
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :