1.

A sphere is placed on two similar cubes as shown. All surfaces are smooth. When velocity of sphere is 10ms^(-1) vertical down then find magnitude of velocity of the block B with respect to block C.

Answer»

`10sqrt(3) ms^(-1)`
`20sqrt(3)ms^(-1)`
`30sqrt(3)ms^(-1)`
`40sqrt(3)ms^(-1)`

Solution :`10cos 30^(@)=V_(B) cos 60^(@)`
`(10sqrt(3))/(2)=V_(B)(1)/(2)`
`V_(B)=10sqrt(3)`


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