Question

A man standing 300 m in front of a cliff fires a cannon. after how many seconds later will he hear its echo? explain your reasoning. speed of sound in air is 330 m/s.

Answer 1

Answer: He hears the echo after 3 s. On moving closer to the cliff by 82. 5 m, he fires again and hears the echo after 2. 5 s.

Explanation: