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Q. The ceiling is of height 3.10 m, and the balloons are launched at a velocity of 9.5 m/s.

The acceleration of gravity is 9.8 m/s2.

At what angle should they be launched to just graze the ceiling?

Q. Two students with vibrating 440Hz tuning forks walk away from each other with equal speeds. How fast must they walk so that they each hear the frequency of 433 from the other fork?

Keep in mind that the speed of sound is 343 m/s.

• Category:- Physics
• Reference No.:- M9292701

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