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/ is a plane mirror.The velocity of the rat's image in the mirror is ?

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

but the ans is 2/..