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311.

M.I. of sphere of 0.5 m radius about a mutually perpendicular axis (Z-axis) when its M.I. about X-axis and Y-axis are 50 kgm2 and 50 kgm2 is

A.	25 Kgm2	B.	100 Kgm2
C.	50 Kgm2	D.	12.5 Kgm2

312.

A man lifts a stone weighting 300 g from the ground to a height of 2m and throws it horizontally with a velocity of 6 m/sec. The work done by the man is

A.	5.886 J	B.	7.686 J
C.	8.343 J	D.	11.286 J

313.

Work done by a body of mass 100 kg moving along a circular path of radius 2 m with a uniform velocity of 10 m/sec is

A.	5000 J	B.	2500 J
C.	509.68 J	D.	None of the above