A solid cube just gets completely immersed in water when a 0.2 kg mass is placed on it. If the mass is removed, the cube is 2 cm above the water level. What is the length of each side of the cube?

Official answer(c) 1 and 3 only

Official answer(d) 1, 2 and 3

Official answer(d) 1, 2 and 3

Official answer(c) the effective area of contact between the wheel and axle is reduced

Official answer(c) 1, 2 and 4

Official answer(d) 1, 2 and 3