A man fires a rifle in front of a cliff and hears the echo after 3 seconds. Calculate the distance of the man form if velocity of sound in air is 340 m/s.

A man on the deck of a ship is 16 m above water level. He observes that the angle of elevation of the top of a cliff is 45^@ and the angle of depression of the base is 30^@ . Calculate the distance of the cliff from the ship and the height of the cliff.

A man on the deck of a ship is 12 m above water level. He observes that the angle of elevation of the top of a cliff is 45^@ , and the angle of depression of the base is 30^@ . Calculate the distance of the cliff from the ship and the height of the cliff.

A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a SONAR the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine? (Speed of sound in water = 1450 m s^-1 ).

A sonar device on a submarine sends out a signal and receives an echo 5s later. Calculate the speed of sound in water if the distance of the object from submarine is 3,625 m.

A stone thrown horizontally with velocity u, falls on the ground after 0.5 second at a distance of 5m from where it was thrown.The velocity of the stone 0.5s later is 3u/2 What was the initial velocity?

The time between a clap and its echo from a wall is 0.1 s. If the distance of the wall be 17.5 m, calculate the speed of sound.

A man claps near a cliff and echo is heard after 5 s. If the velocity of sound is 346 ms^-1 , then what will be the distance between the man and the cliff ?