A block of ice with a mass of 2 kg absorbs 6000 J of energy as it melts. What is the specific latent heat of fusion for the ice (Changes of state and specific latent heat)

The correct answer is 3000 J/kg.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: A block of ice with a mass of 2 kg absorbs 6000 J of energy as it melts. What is the specific latent heat of fusion for the ice (Changes of state and specific latent heat). The correct response is 3000 J/kg, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Changes of state and specific latent heat, the marking point should connect directly to calculate specific latent heat when energy transferred and mass are known. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 411 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.