# physics

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A ball is dropped from a high building. Using the approximate value of g = 10 m/s2, find the change in velocity between the fourth and seventh second of its flight

• physics -

find v(7) : v(7)=10*7=70
find v(4) : v(4)=10*4=40

calculate the change.

• physics -

30 is the change

• physics -

30m/s

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