A toy rocket is launched straight up. At the exact top of its flight path, which of the following is true?
A
Its velocity and acceleration are zero
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B
Its velocity is zero and acceleration is 9.8m/s2
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C
It velocity is 9.8m/s and acceleration is 9.8m/s2
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D
It velocity is 9.8m/s and acceleration is zero
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E
It velocity is 9.8m/s and displacement is 9.8m
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Solution
The correct option is E Its velocity is zero and acceleration is 9.8m/s2 At the exact top of flight its velocity becomes zero but not the acceleration , because it is under the effect of gravitational acceleration (9.8m/s2).