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Subject :NSO    Class : Class 9

Two balls are dropped to the ground from different heights. One ball is dropped 2 s after the other but they both strike the ground at the same time. If the first ball takes 5 s to reach the ground, then the difference in initial heights is (Take g = 10 ms-2)

A20 m
B80 m
C170 m
D40 m

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