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A boy standing on the top of a tower of height 54 ft. throws a packet with a speed of 20 ft/s directly aiming towards his friend standing on the ground at a distance of 72 ft from the foot of the tower. The packet falls short of the person on the ground by x xx(16)/(3) ft. The value of x is

When the primary root in short lived and replaced by large number of thin roots, it constitutes the