CE and DF are two walls of equal height (20 meter) from which two particles A and B or same mass are projected as shown in the figure. A is projected horizontally towards left while B is projected at an angle `37^(@)` (with horizontal towards left) with velocity `15 m//sec`. If A always sees B to be moving perpendicular to EF then the range of A on ground is A. 24 mB. 30 mC. 26 mD. 28 m

CE and DF are two walls of equal height (20 meter) from which two part

1.	CE and DF are two walls of equal height (20 meter) from which two particles A and B or same mass are projected as shown in the figure. A is projected horizontally towards left while B is projected at an angle `37^(@)` (with horizontal towards left) with velocity `15 m//sec`. If A always sees B to be moving perpendicular to EF then the range of A on ground is A. 24 mB. 30 mC. 26 mD. 28 m
Answer» Correct Answer - A From given conditions `V_(A)=V_(B) cos 37_(0) = 15.(4)/(5) =12 m//sec` `:.` time of flight of `A(t) = sqrt((2 xx 20)/(10))=20 sec` `rArr` Range `=V_(A) t = 24 m`.

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