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Two Equal Masses Travel in Opposite Directions with Equal Speed

Question 37
Multiple Choice

Two equal masses travel in opposite directions with equal speed. If they collide in a perfectly elastic collision, then, just after the collision, their velocities will be A) zero. B) equal to their original velocities. C) equal in magnitude but opposite in direction to their original velocities. D) less in magnitude and in the same direction as their original velocities. E) less in magnitude and opposite in direction to their original velocities.

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Q 38
Two equal masses travel in opposite directions with equal speeds. They collide in a collision that is between elastic and inelastic. Just after the collision, their velocities are A) zero. B) equal to their original velocities. C) equal in magnitude but opposite in direction to their original velocities. D) less in magnitude and in the same direction as their original velocities. E) less in magnitude and opposite in direction to their original velocities.
Q 39
A bullet of mass m and velocity strikes and becomes imbedded in a wooden block of mass M, which is initially at rest on a frictionless surface. The ratio of the velocity of the system after collision to the initial velocity of the bullet is A) (M + m)/m B) (M + m)/M C) M/(m + M) D) m/(m + M) E) M/(m - M)
Q 40
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