Posted by james on Wednesday, July 25, 2012 at 6:33pm.
While the upward velocity is decreasing, there is downward acceleration at rate a = 3 m/s^2
At time T1, the scale reads force F.
W - F = M a
F = W - M a = W - (W/g) a
= W (1 - a/g) = 40 lb * (6.8/9.8)
If acceleration = 0 at T2, the scale reads 40 lb then. We are able to use metric units for a and g because We are calculating a ratio.
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