Addition of sugar (or salt or any soluble compound) to ice essentially reduces the freezing point of ice, a phenomenon known as depression of freezing point with added solute. The ice would therefore melt at much lower temperature (than before the addition of sugar) and also less faster.
sugar
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Sugar. Salt often slows down the process of melting, so sugar is what would melt it faster.
Salt
Because if not it will melt faster
You need to determine what you think will melt the fastest, and that will be your hypothesis. If you think that pepper will melt it faster, you would say "My hypothesis is that the pepper will melt ice faster than the other variables (sand, salt, and sugar)."
Because when you add sugar to ice it is no longer ice it is 'sugar ice' and therefore has a different melting point from pure ice.
Salt would melt the ice cube faster because if you have noticed, people put down salt to melt the ice.
The ice cube made of salt and water will melt faster than the one made of sugar and water, which in turn will melt faster than the one made from just water. Salt and sugar lower the freezing point of water, which causes the ice to melt faster.
Because its molar mass is lower.
You need to determine what you think will melt the fastest, and that will be your hypothesis. If you think that pepper will melt it faster, you would say "My hypothesis is that the pepper will melt ice faster than the other variables (sand, salt, and sugar)."
Sugar has very little effect on melting point - it is too high molecular weight. That might answer your question, which does not make sense as written. Thus, it melts faster with sugar, because other ice cubes slow melting.