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A 0.028 kg rifle bullet traveling 210 m/s buries itself in a 3.1 kg pendulum hanging on a 2.5 m long string, which makes the pendulum swing upward in an arc.

1. Determine the vertical and horizontal components of the pendulum's displacement.

  • Physics -

    Use conservation of momentum to find the initial velocity of the block/bullet.

    Now using that velocity, find its intial KE. If you set that KE = mgh, h is the max vertical height.

    Now draw the figure, find out at h what the angle the pendulum is, and from that, the horizontal movement.

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