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Acceleration due to gravity is 32 ft/sec2 = 32*12 in/sec2

If starting from standstill, (initial velocity = 0 in/sec),

s = 0.5*g*t2

so 6 = 0.5*32*12*t2

which gives t2 = 1/32

or t = sqrt(1/32) = 0.1768 seconds (to 4 dp)

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