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peweee17

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## Homework Statement

The terminal velocity of a 2×10−5 kg raindrop is about 7m/s. Assuming a drag force Fd= - bv,

Assuming a drag force determine the time required for such a drop, starting from rest, to reach 63% of terminal velocity.

## Homework Equations

Fd=-bv

Sum of F-ma

## The Attempt at a Solution

I use Fd=-bv to solve for b then used Fd-Fg=ma and reduced that to dv/dt=-g-(bv/m) but don't know how to determine time.

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