1.

A certain rough platform perform oscillating given by `y_(p)=A sin omegat hatj`, while another block kept on the platform perform oscillation on the platform given by `x_(B)=A cos(omegat)hati`. As seen from, the ground.A. The direction of frictional force on the block will always be opposite to its velocity relative to the platform.B. The direction of frictional force on the block will be always opposite to its velocity relative acceleration w.r.t. platform.C. The direction of frictional force on the block at any instant will be `cos(omegat)hati+sin(omegat)hatj`D. Direction of friction at any instant will be `sin(omegat)hati+cos(omegat)hatj`

Answer» `v_(p)=A omega cos omega hatj`
`v_(B)=-Aomega sin(omega t)hatj`
`rArr` Direction of friction `= cos omega t hati+sin omega t hatj`


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