with what speed should a ball be thrown up vertically so that it reaches a maximum height of 4.9m? After how much time from beginning will it came back to initial position? Take g=9.3m/s^2?

with what speed should a ball be thrown up vertically so that it reach

1.	with what speed should a ball be thrown up vertically so that it reaches a maximum height of 4.9m? After how much time from beginning will it came back to initial position? Take g=9.3m/s^2?
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with what speed should a ball be thrown up vertically so that it reaches a maximum height of 4.9m? After how much time from beginning will it came back to initial position? Take g=9.3m/s^2?​

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with what speed should a ball be thrown up vertically so that it reaches a maximum height of 4.9m? After how much time from beginning will it came back to initial position? Take g=9.3m/s^2?