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CBSE Class 11-science Answered

A worker drops a hammer from the top of a 60m high building. If the speed of sound in air is 340 m/s, how long does the worker have to shout down to warn colleagues (if his warning is to reach them before the hammer!) Neglect air resistance.
Asked by Topperlearning User | 21 Apr, 2014, 08:37: AM
answered-by-expert Expert Answer
For the hammer:
Initial speed u = 0
Acceleration a = 9.81 m/s2
Distance s = 60m
Using the second equation of motion, we get

                                                                                                                         
The length of time for the hammer to reach the ground minus the length of time it takes for the shouted warning to reach the workers on the ground gives the difference in travel time between hammer and shout.
That is,   3.5 - 0.18 = 3.32 s
Therefore the warning must be shouted within 3.32 seconds of dropping the hammer.
Answered by | 21 Apr, 2014, 10:37: AM

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