Physics

Physics

Problem

7. A projectile of mass M1M_{1} is fired horizontally from a spring gun that is initially at rest on a frictionless surface. The combined mass of the gun and projectile is M2M_{2}. If the kinetic energy of the projectile after firing is K, the gun will recoil with a kinetic energy equal to (A) K (B) M2M1K\frac{M_{2}}{M_{1}} K (C) M12M22K\frac{M_{1}^{2}}{M_{2}^{2}} K D) M1M2−M1K\frac{M_{1}}{M_{2}-M_{1}} K (E) M1M2−M1K\sqrt{\frac{M_{1}}{M_{2}-M_{1}}} K (A) K (B) M2M1K\frac{M_{2}}{M_{1}} K (C) M12M22K\frac{M_{1}^{2}}{M_{2}^{2}} K D) M1M2−M1K\frac{M_{1}}{M_{2}-M_{1}} K (E) M1M2−M1K\sqrt{\frac{M_{1}}{M_{2}-M_{1}}} K

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