Q.

A rectangular billiard table has vertices at P0,0 , Q0,7, R10,7, and S10,0. A small billiard ball starts at M3,4moves in a straight line to the top M3,4, moves in a straight line to the top of the table, bounces to the right side of the table, and then comes to rest at N7,1. The y-coordinate of the point where it is the right side is

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya

a

3.7

b

3.8

c

3.9

d

4

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

tanθ=a−13=7−a10−bAlso, tanθ=7−4b−3=3b−3Hence, 3b−3=a−13=7−a10−bFrom the first two relations, we have 9=ab−b−3a+3or 3a+6=ab−b              (1)From the last two relations, we have 10a−ab−10+b=21−3aor 13a−ab+b=31or ab−a=13a−31         (2 )Hence, from (1) and (2),3a+6=13a−31or  10a=37or a=3.7
Watch 3-min video & get full concept clarity
score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon