## Description

**Dropping**

A body of weight 32 lb is dropped from rest from a height of 100 ft in a medium offering resistance proportional to the velocity.

If the limiting or terminal velocity is 400 ft/sec, find the velocity and displacement at any time. Find the time at which the velocity is 200 ft/sec.

**Bobbing**

A 360 lb block of wood in the form of a 2 ft cube is floating in liquid which has a density of 60 lb/ft^{3}.

If the cube is depressed, so that its upper face is level with the surface of the liquid, and then released, find the differential equation of its motion. Solve the differential equation and find the period of the motion

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