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A block of mass m is placed on a surface with a vertical cross section given by y = 6 x 3 . If the coefficient of friction is 0.5, then maximum height above the ground at which the block can be placed without slipping is -

1. m 3 2
2. m 3 1
3. m 2 1
4. m 6 1

Correct answer: m 6 1

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