A proton (p) of mass 1.93-u(unified atomic mass units) traveling with a speed 2.22 x 104 m/s of has an elastic head-on collision with a helium (He) nucleus (mHe = 4.00 u) initially at rest. What is the velocity of helium nucleus after the collision?

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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Chapter8: Momentum And Collisions
Section: Chapter Questions
Problem 21P
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A proton (p) of mass 1.93-u(unified atomic mass units) traveling with a speed 2.22 x 104 m/s of has an elastic head-on collision with a helium (He) nucleus (mHe = 4.00 u) initially at rest.

What is the velocity of helium nucleus after the collision?
(As mentioned in Chapter 1, 1 u = 1.66 x 10–27 kg but we won’t need this fact.)

Assume the collision takes place in nearly empty space.

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