### Why fan is kept in a return airway and why the evasee shape

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##### Reference no: EM13542208

1.A shell bursts on contact with the ground and pieces from it fly in all directions with velocities up to 49 metres per second. Show that a man 122.5 metres away is in danger for 5?2 second.

2.In coal mines, why fan is kept in a return airway and why the evasee shape is constructed? also, why it is bent at the end?

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