Randomized multiple-choice question

A cannon ball with mass $m =1.8\rm\ kg$ is fired downward from a cliff at a height $h = 7.143\rm\ m$, at an angle $\theta = 37^o$ with respect to the horizontal, and an initial velocity $v_0 = 21 \rm\ m/s$, as illustrated in the figure below.

Suppose the ball hits the ground a distance $d = 8 \rm\ m$ from the base of the cliff. How long is the ball in the air? Assume the acceleration due to gravity is $g=9.8 \rm\ m/s^2$.

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Randomized multiple-choice question

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Started at:
2026-09-19 07:04:22 (CDT)
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{
  "t": {
    "key": "a",
    "html": "$t = 0.477\\rm\\  s$",
    "score": 1,
    "feedback": null
  }
}
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