- #1
ADH
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A kid jumps a meter into the air. How long before he lands?
The answer to this question is .95 seconds.
I first calculated the time it took for the kid to fall downward. Which was about .45 seconds. But I used the acceleration of 9.8 m/s^2 since he was falling downward. My teachers answer of .95 is assuming that he jumps upward at the rate of 9.8 m/s^2. Is that accurate? I mean, the kid could have jumped up really quickly, but gravity would still pull him down at a rate of .45 sec.
Thank you for the clarification.
Also what is this kid's initial velocity? Is it zero?
The answer to this question is .95 seconds.
I first calculated the time it took for the kid to fall downward. Which was about .45 seconds. But I used the acceleration of 9.8 m/s^2 since he was falling downward. My teachers answer of .95 is assuming that he jumps upward at the rate of 9.8 m/s^2. Is that accurate? I mean, the kid could have jumped up really quickly, but gravity would still pull him down at a rate of .45 sec.
Thank you for the clarification.
Also what is this kid's initial velocity? Is it zero?