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unscientific

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## Homework Statement

The drag force experienced by the spherical pebble in water is given by: (0.5)Cp

_{w}Av

^{2}

mass of pebble = 83.8g

radius of pebble = 2 cm

C = 0.7

(a) Write down the differential equation governing pebble's descent. (done)

(b) Derive an expression for terminal velocity and evaluate it. (done)

(c) The pebble is dropped 5m above surface of lake, which is also 5m deep. Show that the pebble travels about 10cm in water before reaching it's terminal velocity.

## The Attempt at a Solution

__Part (a)__

__Part (b)__

__Part (c)__