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A toy rocket is launched straight up. At the exact top-of its' flight path, which of the followings is true?

A. Its velocity and acceleration are zero

B. Its velocity is zero and acceleration is 9.8 m/s2

C. Its velocity is 9.8 m/s and acceleration is zero

D. Its velocity is 9.8 m/s and acceleration is 9.8m/s2

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সঠিক উত্তরঃ B. Its velocity is zero and acceleration is 9.8 m/s2

Explanation: