4. Take the general case of a body of mass m₁ and velocity v₁ elastically colliding striking a stationary (20) body of mass m2 head-on. (a) Find the final velocities v and v2. (b) What happens in the extreme case when my is much smaller than m₂? Cite a common example of this. (c) What happens in the extreme case when my is much larger than m₂? Cite a common example of this. (d) What happens in the case when m₁ = m₂? Cite a common example of this.

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