The terminal velocity of a 2.8 10-5 kg raindrop is about 6 m/s. (a) Assuming a drag force FD = -bv, determine the value of the constant b.
(b) Determine the time required for such a drop, starting from rest, to reach 63 percent of terminal velocity.

I found the first answer in a to be 4.5733e-5= b which was correct, but the second part is tripping me up.


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