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1-a rock is weighted in air and found to have a mass of 81.0g. it is...

1-a rock is weighted in air and found to have a mass of 81.0g. it is dropped into a beaker, that was initially filled level full of water, and completely submerged.if 22.3cm^3 of water overflow, what is the density of the rock?
2-a bullet is moving at 414 m/s as it leaves a rifle barrel that is 6.1cm long.if the mass of the bullet is 0.028kg, what average force was applied to it in the barrel?
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