What is the most reliable method (of the property of minerals) to identify a mineral?

This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Amira pulls a 3 pound wagon 4 feet. how much work has she done?