JEE Main 2014 Physics question

PhysicsMotion in a Straight LineJEE Main 2014

A bullet loses of its velocity passing through one plank. Considering uniform retardation, the number of such planks that are required to stop the bullet can be:

Answer: (3)

Solution

After one plank the speed is . With uniform retardation, , so the loss in per plank is $ -

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Question ID VK-104615