physics

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A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 14 m/s. The cliff is h = 39 m above the water's surface.

(a) How long does it take for the stone to fall to the water?

(b) With what speed does it strike the water?

  • physics -

    (a)
    d = Vi*t + (1/2)*a*t^2

    Keep in mind that to use the equation to find time with respect to displacement in height, consider only the vertical component of the initial velocity. (You did not specify a direction for the initial velocity).

    (b)
    Having found the time from part (a), use a = (Vf - Vi)/t to find the velocity when it hits the water.

  • physics -

    a)2.910
    b)11.089

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