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Grade: 12

                        

A body is thrown vertically up with a velocity u .It passes three points A,B and C in its upward journey with velocities u 2 , u 3 and u 4 respectively. The ratio of the separations between points A and 6 and between B and C i.e , AB BC is A) 1 B) 2 C) 10 7 D) 20 7

8 months ago

Answers : (2)

Saurabh Koranglekar
askIITians Faculty
10233 Points
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8 months ago
Vikas TU
13786 Points
							
Dear student 
Here is the short trick 
A to B u^2 /9 = u^2 /4 -2gh1 
2gh1 = 5u^2/36.......(i) 
B to C: u^2/16 = u^2 /9 -2gh2 
2gh2 = 7u^2/144 ....(ii)
h1/h2 = 5/36 * 144/7 = 20/7 = AB/BC 
8 months ago
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