Planetary orbits are
A) parabolas.
B) ellipses.
C) circles.
D) none of the above.
Correct Answer:
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Q72: The vertical acceleration of a projectile
A)equals g
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Q75: The horizontal acceleration of a projectile
A)is zero.
B)stays
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A)is zero.
B)stays
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Q82: Which statement is incorrect? The gravitational force
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