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# An iron ball and wooden ball of same radius are released from a height 'h' in vacuum. The time taken by both of them to reach ground is

a) unequal b) exactly equal c) zero d) roughly equal

Time of decent $t= \sqrt {\large\frac{2h}{t}}$
Since no other force are acting in vacuum time of decent will be exactly equal
Hence b is the correct answer

edited Feb 17, 2014 by meena.p