19. Two fixed frictionless inclined...
Question

19. Two fixed frictionless inclined planes making angles 30° and 60° with the vertical are shown in the figure. Two blocks A and B are placed on the two planes. What is the relative vertical acceleration of A with respect to B? 60 30°

JEE/Engineering Exams
Physics
Solution
107
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For the motion of block along inclined plane ( operatorname{mg} sin theta=m a ) ( a=g sin theta ) where a is along the inclined plane. The vertical component of acceleration is ( mathrm{g} sin ^{2} theta ) Therefore, the relative vertical acceleration of ( mathrm{A} ) with respect to ( mathrm{B} ) is ( gleft(sin ^{2} 60-sin ^{2} 30right)=g / 2=4.9 m s^{-2} ) (in vertical direction) For the motion of block along inclined plane ( operatorname{mg} sin theta=m a ) ( a=g sin theta ) where a is along the inclined plane. The vertical component of acceleration is ( mathrm{g} sin ^{2} theta ) Therefore, the relative vertical acceleration of ( mathrm{A} ) with respect to ( mathrm{B} ) is ( gleft(sin ^{2} 60-sin ^{2} 30right)=g / 2=4.9 m s^{-2} ) (in vertical direction)