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A block of base 10 cm*10 cm and height 15 cm is kept on an inclined plane.The coeffecient of friction between them is 3^1/2. The inclination a of this inclined plane from the horizontal plane is gradually increased from 0 degree.Then,
a) at a=30, the block will start sliding down the plane.
b) the block will remain at rest on the plane up to certain a and then it will topple
c) at a=60, the block will start sliding down the plane and continue to do so at higher angles
d) at a=60, the block will start sliding down the plane and on further increasing a ,it will topple at certain a
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