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Demo: Randomized multiple choice options

A ball with mass $m =1.6\rm\ kg$ is thrown downward from the top of a building with height $h = 12\rm\ m$ and initial speed $v_0$ at an angle $\theta$ with respect to the horizontal as shown in the figure. The $x$-component of the initial velocity $v_{x0} = 20.704\rm\ m/s$, and the ball hits the ground a distance $d = 18\rm\ m$ from the building as shown in the figure.

How long is the ball in the air?

(a)

$t = 4.225\rm\ s$

(b)

$t = 7.5\rm\ s$

(c)

$t = 0.869\rm\ s$

(d)

None of the above

Correct answer

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Question

QID:

demo/randomMultipleChoice

Title:

Demo: Randomized multiple choice options

Variant

Started at:

2026-08-04 21:54:15 (CDT)

Duration:

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{
  "t": {
    "key": "c",
    "html": "\n    $t = 0.869\\rm\\ s$\n  ",
    "score": 1,
    "feedback": null
  }
}

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