1.

Two fixed frictionless inclined plane making an angle 30o and 60o with the vertical are shown in the figure. Two block A and B are placed on the two planes. What is the relative vertical acceleration of A with respect to B ?(1) 4.9 ms–2 in horizontal direction(2) 9.8 ms–2 in vertical direction(3) zero(4) 4.9 ms–2 in vertical direction

Answer»

4 

mg sin q = ma

a = g sin q

where a is along the inclined plane

vertical component of acceleration is g sin2 q

relative vertical acceleration of A with respect to B is

g[sin260 - sin230] = g/2 = 4.9 m/s2 in vertical direction.



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