I think that ball a hit the ground because it says that it went straight down.
<span>Since forces are vector quantities, we must indicate direction using positive and negative values. East will be assigned positive and west will be negative. Friction will act as a negative force since it impedes action. To calculate the net force we sum the vector quantities, as follows. Net force equals 50n which is derived by the following calculation: 300n-220n-30n.</span>
Necrosis - the death of most or all of the cells in an organ or tissue due to disease, injury, or failure of the blood supply.
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30 grams of radioactive isotope have passed.
