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Simple multiple-choice question

A cannon ball with mass $m = 1.8 \rm\ kg$ is fired downward from a cliff at a height $h = 2.67 \rm\ m$, at an angle $\theta = 31^o$ with respect to the horizontal, and an initial velocity $v_0 = 20 \rm\ m/s$, as illustrated in the figure below.

Suppose the ball hits the ground a distance $d = 4 \rm\ m$ from the base of the cliff. How long is the ball in the air? Assume the acceleration due to gravity is $g=9.8 \rm\ m/s^2$.

(a)

$t = 0.388 \rm\ s$

(b)

$t = 0.2 \rm\ s$

(c)

$t = 0.738 \rm\ s$

(d)

$t = 0.259 \rm\ s$

(e)

None of the above

Correct answer

(e) None of the above

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QID:

gallery/multipleChoice/simple

Title:

Simple multiple-choice question

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Started at:

2026-08-04 21:49:56 (CDT)

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{
  "t": {
    "key": "e",
    "html": "None of the above",
    "score": 1,
    "feedback": null
  }
}

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