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A block of mass m is placed on a surface having vertical cross-section given by y = 4 x 2 . If coefficient of friction is 0.5, the maximum height above the ground at which block can be placed without slipping is:

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

Correct answer: 4 1 m

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