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# a body is thrown up the incline with angle @ The time of ascent is Ta and time of descent is Tb If TaTb is equal to nshow n is smaller than 1

24 Points
9 years ago

Dear Amitesh kumar,

To configure, initial velocity should be there. I mean whether n is less than 1 or not depend on initial speed .

Explanation is as follows.

by symmetry we can say that Ta and T b would be equal. and each of them would be u sin@/g . Where u is initial velocity. The product of Ta and Tb would be square of  that. Now we know sin@ is always less that 1. so to be whole quantity less that 1, u should atleast be equal to g. Finally TaTb to be less than 1 initial velocity should atleast be  equal to g means 9.8 m/s.

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