일반물리학 1 — Center of Mass and Linear Momentum: Problem 72

72 In the two-dimensional collision in Fig. 9-21, the projectile particle has mass $m_1 = m$, initial speed $v_{1i} = 3v_0$, and final speed $v_{1f} = \sqrt{5}v_0$. The initially stationary target particle has mass $m_2 = 2m$ and final speed $v_{2f} = v_2$. The projectile is scattered at an angle given by $\tan \theta_1 = 2.0$. (a) Find angle $\theta_2$. (b) Find $v_2$ in terms of $v_0$. (c) Is the collision elastic?