physics

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A plane flying horizontally above Earth’s surface at
150. meters per second drops a crate. The crate strikes
the ground 30.0 seconds later. What is the magnitude of
the horizontal component of the crate’s velocity just
before it strikes the ground?

I know the answer is 150 m/s but why?

  • physics -

    10. A cannon elevated at an angle of 35º to the
    horizontal fires a cannonball, which travels the path
    shown in the diagram below. [Neglect air resistance and
    assume the ball lands at the same height above the
    ground from which it was launched.]
    If the ball lands 7.0 × 10² meters from the cannon 10.
    seconds after it was fired, what is the horizontal
    component of its initial velocity?
    (A) 7.0 m/s (B) 35 m/s (C) 49 m/s (D) 70. m/s

  • physics -

    oops but that's another question

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