Question
A stone dropped from top of the tower 300 m high splashes into water of pond near the base of tower. When is the splash heard at the top? Velocity of sound in air = 340m/s, g = 9.8 m/s2.
Solution
Let t be the time taken by stone to reach the surface of water in pond.
When the stone strikes the surface of water, splash is produced.
Let, t2 be the time taken by the splash to reach top of tower.
The total time after which the splash is heard after dropping the stone is,
t = t1 + t2
The stone is dropped from height 300m.
The time taken by the stone to reach the surface of water can be calculated by using the thrid equation of motion,
The time taken by splash to reach the top of tower is,
Therefore, total time taken to hear the splash at the top is,
Total time
When the stone strikes the surface of water, splash is produced.
Let, t2 be the time taken by the splash to reach top of tower.
The total time after which the splash is heard after dropping the stone is,
t = t1 + t2
The stone is dropped from height 300m.
The time taken by the stone to reach the surface of water can be calculated by using the thrid equation of motion,
The time taken by splash to reach the top of tower is,
Therefore, total time taken to hear the splash at the top is,
Total time
