Physics-
General
Easy

Question

From the top of tower, a stone is thrown up. It reaches the ground in t subscript 1 end subscript second. A second stone thrown down with the same speed reaches the ground in t subscript 2 end subscript second. A third stone released from rest reaches the ground in t subscript 3 end subscript second. Then

  1. t subscript 3 end subscript equals fraction numerator open parentheses t subscript 1 end subscript plus t subscript 2 end subscript close parentheses over denominator 2 end fraction  
  2. t subscript 3 end subscript equals square root of t subscript 1 end subscript t subscript 2 end subscript end root  
  3. fraction numerator 1 over denominator t subscript 3 end subscript end fraction equals fraction numerator 1 over denominator t subscript 1 end subscript end fraction minus fraction numerator 1 over denominator t subscript 2 end subscript end fraction  
  4. t subscript 3 end subscript superscript 2 end superscript equals t subscript 2 end subscript superscript 2 end superscript minus t subscript 1 end subscript superscript 2 end superscript  

The correct answer is: t subscript 3 end subscript equals square root of t subscript 1 end subscript t subscript 2 end subscript end root

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