Ancient Indian coinage evolved over several centuries, and its features offer important insights into the economic, political, and cultural life of ancient India. Here are three key features:
1. Metal used: Coins in ancient India were made from a variety of metals, including gold, silver, copper, and bronze. Gold coins were typically issued by kings to signify prosperity and power.
2. Symbolism and Iconography: Coins often carried symbols like animals, deities, or the king's image. For example, the Mauryan coins often featured the wheel (Ashoka Chakra) or elephants, reflecting both religious and political symbolism.
3. Inscription: Many coins, especially during the Mauryan period, featured inscriptions in Prakrit or Brahmi script. These inscriptions often included the names of rulers and their titles, affirming their authority and legitimacy. For instance, the coins issued by Chandragupta Maurya often had inscriptions of his name.
These features reflect the technological advancement and the importance of coinage in administration and trade.

A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:
(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?