Ball a Is Dropped from Rest from a Window

question 71

Multiple Choice

Ball A is dropped from rest from a window. At the same instant, ball B is thrown downward; and ball C is thrown upward from the same window. Which statement concerning the balls after their release is necessarily true if air resistance is neglected?

• A)At some instant after it is thrown, the acceleration of ball C is zero.
• B)All three balls strike the ground at the same time.
• C)All three balls have the same velocity at any instant.
• D)All three balls have the same acceleration at any instant.
• E)All three balls reach the ground with the same velocity.

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