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The correct answer is B because the cardshave numbers starting from 4 not from 2 hence 2 is not inculded so its probability is zero. Easy peasy.?
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The correct answer is B because the cardshave numbers starting from 4 ...
Time = t
height = h
h = 1/2 gt^2
2h = gt^2
time to travel the first half = (t-1)
so, 
h/2  = 1/2 g (t-1)^2
h = g (t-1)^2
divide both equations
2= t^2 / (t-1)^2
taking under rot on both sides
t/t-1 = √2 = 1.414
t = 1.414 t - 1.414
t = 3.41 s
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The correct answer is B because the cardshave numbers starting from 4 not from 2 hence 2 is not inculded so its probability is zero. Easy peasy.?
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