Earth gravitational acceleration: g=9.8ms−2
When a small ball is lifted up with an acceleration a=4.9ms−2 , the tension of the thread equals to
Tu=m(g+a) When it is lowered with the same acceleration, , the tension of the thread equals to
Td=m(g−a) The ratio:
TdTu=g−ag+a=9.8−4.99.8+4.9=3
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