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7 May 2008 20:57:12 IST

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try this

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a rat runs in between two adjacent corners of a hall along the floor,the velocity of the rat is uniform & is 1m/s .The roof of the hall has a gentle slope of 1/ $\sqrt{3}$ is a plane mirror.The velocity of the rat's image in the mirror is ?

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pink_ele

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Joined: 16 Jan 2007

Posts: 1836

8 May 2008 00:23:14 IST

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well,

here........let u=x.n v=x'

x=x'..ryt

den

y/x=1/rt3

so

dy/dt=1/rt3 x (dx/dt)

now dy/dt=1m/s

so dx/dt=rt3m/s

dx'/dt=rt3m/s

n relative velocity is 2rt3:I

draco

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8 May 2008 11:09:13 IST

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but the ans is 2/ $\sqrt{3}$ ..

pink_ele

Blazing goIITian

Joined: 16 Jan 2007

Posts: 1836

8 May 2008 13:04:56 IST

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yeah d ans comes if we take axis opposite means horizontal land as x axis den ..it comes to be 2/rt3

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