A Ball Is Thrown Upwards and Caught When It Comes

question 25

Multiple Choice

A ball is thrown upwards and caught when it comes back down.In the presence of air resistance,the speed with which it is caught is always

• A)more than the speed it had when thrown upwards.
• B)less than the speed it had when thrown upwards.
• C)the same as the speed it had when thrown upwards.
• D)impossible to determine.

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Definitions:

Low-Viscosity

Describes a fluid that easily flows because it has a low resistance to deformation.

Pyroclastic Flow

A fast-moving current of hot gas and volcanic materials that flows down the side of a volcano during an explosive eruption, capable of destroying everything in its path.

Volcanic Breccia

A coarse-grained volcanic rock composed of angular fragments of volcanic material cemented together by finer particles or a mineral matrix.

Dome Collapse

The falling in of the roof of a volcanic dome due to gravitational failure, often leading to pyroclastic flows.