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A stone is thrown horizontally at 20 m/s from a tower. After 3 s (g = 10 m/s2) its vertical velocity component is:
A20 m/s
B10 m/s
C30 m/s
D50 m/s
Answer & Solution
Correct answer: C. 30 m/s
Vertical speed grows as gt = 10 x 3 = 30 m/s while the horizontal part stays 20 m/s.
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