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CBSE Class 11-science Answered

A bottle dropped from a balloon reaches the ground in 20s. Determine the height of the balloon (i) if it was at rest in air? (ii)if it was ascending with a speed 50 m/s when dropped?
Asked by | 21 Aug, 2012, 12:09: AM
Expert Answer
(i) u=0
  t=20 s
  h=ut+1/2 g t2
    =0+1/2 x 10x20x20
    =2000m
(ii)u=-50
t=20
h=ut+1/2 g t2
  =(-50)x20+1/2 x10x20x20
  =1000m
Answered by | 29 Aug, 2012, 01:02: PM
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