1i got c
and i can give explanation
A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4/3.. A fish inside th e lake in the line of fall of the ball is looking at the ball. At an instant when the ball is 12.8 m above the water surface the fish sees the speed of ball as
A) 9m/s
B) 12 m/s
C) 16m/s
D) 21.33m/s
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10 Answers
62[url=http://iitjee2009solutions.targetiit.com]Solution Key with Question Paper of 2009 IIT JEE[/url]
6220 m above the surface of water in a lake. The refractive index of water is 4/3.. A fish inside th e lake in the line of fall of the ball is looking at the ball. At an instant when the ball is 12.8 m
1/2 g t2 = 20-12.8 = 7.2
taking g=10
t = √1.44
thus t=1.2
v=12. g =12 m/s
Velocity from inside the water will be 3/4x12 = 9 m/s
1u got it all wrong here Nisant bhaiya ans will be 16.. here AD(apparent vel)=μ*(real vel)
ans WILL be 16
any1 supporting me?
1hmmm.........i support kamal...........he is rite nishant bhaiyya........
