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Dynamics of a projectile impacting on a loose granular bed under the acceleration due to gravity g has been studied by fast video photograph. Granular jet formation and projectile penetration are observed in 3D and quasi-2D experiments. It is found that the penetration velocity u can be described by mdu/dt=−γu−κz+mg′, where γ and κ are the parameters which characterize the viscous damping and hydrostatic...
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