100m /sec के वेग से एक गोली किसी दीवाल पर दागी जाती है दीवाल वे अन्तर 10cm की गहराई तक जाकर रूक जाती है दीवाल द्वारा उत्पल मन्दन करे?
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One method for determining the depth of a well is to drop a stone into it and then measure the time it takes until the splash is heard. If d is the depth of the well (in feet) and t1 the time (in seconds) it takes for the stone to fall, then d=16t12, so. t1=d /4.
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