ILW In Fig. 9-21, projectile particle 1 is an alpha particle and target particle 2 is an oxygen nucleus. The alpha particle is scattered at angle θ1 = 64.0° and the oxygen nucleus recoils with speed 1.20 × 105 m/s and at angle θ2 = 51.5°. In
Figure 9-21 An elastic collision between two bodies in which the collision is not head-on. The body with mass m2 (the target) is initially at rest.
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