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15 December, 09:41

A small mailbag is released from a helicopter that is descending steadily at 2.00 m/s. After 5.00s what is the speed of the mailbag

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  1. 15 December, 09:54
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    The acceleration of gravity (on Earth) is 9.8 m/s² downward.

    This means that every falling object gains 9.8 m/s more downward speed

    every second that it falls.

    In 5 seconds of falling, it gains (5 x 9.8 m/s) = 49 m/s of downward speed.

    If it was already descending at 2.0 m/s at the beginning of the 5 sec,

    then at the end of the 5 sec it would be descending at

    (2 m/s + 49 m/s) = 51 m/s.
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