Question

A
body freely falling from rest has a velocity V after it falls through a height h. The distance it has to fall further for its velocity to become double is :A 3h B 6h C 8h D 10h

Answer 1

A body freely falling from rest has a velocity v after it falls through a distance h. The distance it has to fall down further, for its velocity to become double, is ... times h 4 Follow0Jaya Mukkavilli answered this37 helpful votes in Physics, Class XII-ScienceDear student,The body is falling freely under gravity, so the gravitational acceleration = a = gThe initial velocity of the body = u = 0After covering distance = hThe velocity becomes = vSo, v2- u2 = 2ghor v2 = 2ghAfter sometime (t) its velocity becomes double = v' = 2vLet the distance covered in time (t) = h'Here initial velocity = vSo, v'2 - v2 = 2gh'(2v)2- v2 = 2gh'4v2-v2 = 2gh'3v2  = 2gh'3(2gh) = 2gh'3h = h'Thus h' is 3 times h.


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