A 100 g bullet traveling at 400 m/s embeds itself into a stationary 3,9 kg ballistic pendulum. With what initial velocity does the combined system begin to swing?

Answer and explanation

Correct answer: C. 10 m/s

  1. Step 1: Law of conservation of linear momentum: . Step 2. kg, kg, total mass kg. Step 3. m/s. Answer: 10 m/s. Why not the others: Momentum conservation yields exactly 10 m/s.

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