math calculus

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A person stands on a bridge that is 100 feet above a river.

If she drops a pebble how fast is it moving after 2 seconds?
How long does it take the pebble to reach the river below?
She has another pebble that she tosses up with initial speed of 8 feet per second. It goes up, then starts falling down to the river below. By the time it reaches the river what is its speed?

  • physics -

    see the other post

  • math calculus -

    It will be 16ft in 2seconds
    And 100 seconds reach the river

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