A 4 kg rock is at the edge of a cliff 30 meters above a lake. It becomes loose and falls toward the water below.
Calculate its potential and kinetic energy when it is at the top and when it is halfway down.
Its speed is 16 m/s at the halfway point. pls answer

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

What shape would a molecule with two bound groups and two lone pairs have?

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.