A stone is dropped from the top of a tower 500 m high into a pond of water at the base of thetower. When is the splash heard at the top ? Given, g = 10 ms–2 and speed of sound = 340 m/s.

A stone is dropped from the top of a tower 500 m high into a pond of w

1.	A stone is dropped from the top of a tower 500 m high into a pond of water at the base of thetower. When is the splash heard at the top ? Given, g = 10 ms–2 and speed of sound = 340 m/s.
Answer» Distance, s = 500m acceleration, g = 10 m/s² initial speed, u = 0 let the time TAKEN for the stone to REACH the pond = t₁ s = ut₁ + 1/2 gt₁² ⇒ 500 = 0 + (1/2)×10×t₁² ⇒ t₁² = (2×500)/10 = 1000/10 = 100 ⇒ t₁ = √100 = 10s let the time taken by SOUND to reach the top of tower = t₂ speed of sound = 340 m/s t₂ = 500/340 = 1.47s total time = t₁+t₂ = 10+1.47 = 11.47s So the splash will be heard at the top after 11.47 SECONDS.

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A stone is dropped from the top of a tower 500 m high into a pond of water at the base of thetower. When is the splash heard at the top ? Given, g = 10 ms–2 and speed of sound = 340 m/s.

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