As a prank, someone drops a water-filled balloon out of a window. The balloon is

Question

As a prank, someone drops a water-filled balloon out of a window. The balloon is released from rest at a height of 17.6 m above the ears of a man who is the target. Then, because of a guilty conscience, the prankster shouts a warning after the balloon is released. The warning will do no good, however, if shouted after the balloon reaches a certain point, even if the man could react infinitely quickly. Assuming that the air temperature is 20.0 oC and ignoring the effect of air resistance on the balloon, determine how far above the man's ears this point is.

Explanation / Answer

we need to find the pt where distance traveled by balloon by the time sound reaches the target so vel of sound =343.2m/s time taken by sound to reach target=d/v=0.0428s time taken by balloon to reach =1.732sec so he need to shout before (1.732-0.0428)sec

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