There has to be more to this question.
If not and you mean to have it stand as is .....
(3/10) of 100 mm = 30 mm = 3 cm
100 mm is only 10 cm. Are you sure that's what you want ?
a ball is dropped from a height of hundred mm each time he hit the ground it bounce up to a height that is 3/10 of the previous heights how high will the ball bands
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