- How can an object's positive acceleration be calculated?

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How much could cost a Lunar Stone given by Armstrong and carried during the first moon landing ? Find r for infinite geometric sequence and it sum will converge -64, -16, -4, -1,...? Formula S-n sum of first four terms in geometric sequence
a-1 = 8.421, r=2.854 Sum is ? Did you know we have 44000 troops missing and Billions of $$$ missing. Is this repeating AGAIN from 9/11 ? What is the displacement of the ball at t=4 seconds?