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A load W is to be raised by a rope from rest through a height h, the greatest tension which the rope can safely bear is nW. The least time in which the ascent can be made is:
 

Asked by Arushi Juyal 12th November 2017, 3:11 PM
Answered by Expert
Answer:
Refer the force acting at different point in the diagram below
 
Let a be the maximum acceleration.
 
Then (W/g)×a - W = nW
 
(a/g) - 1 = n
 
a = (n+1)g
 
since h = (1/2)at2 we can write 
 

Answered by Expert 13th November 2017, 1:02 PM
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