Physics

posted by hewhomustbenamed82

A bullet of mass 8 gram is fired into a block of mass 2,5 kg initially at rest at the edge of a frictionless table of height 1 m. The bullet remains in the block, and after impact the block lands a distance 2 m from the bottom of the table. Determine the initial speed of the bullet.

  1. Damon

    first figure out how long it took the block to fall to the floor:
    h = (1/2) g t^2
    t = sqrt (2 h/g)
    so it went 2 meters in t seconds
    so the horizontal speed was
    u = 2/t
    NOW you have a conservation of momentum problem
    u(2.5 + .008) = .008 v
    solve for v

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