An object falls 210 m in 6.3 s. What was it’s initial velocity? Express your answer with the correct number of significant digits.

Question

An object falls 210 m in 6.3 s. What was it’s initial velocity? Express your answer with the correct number of significant digits.

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Latifah 5 years 2021-08-22T10:06:50+00:00 1 Answers 42 views 0

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  1. Helga
    0
    2021-08-22T10:08:13+00:00
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    Answer:

    u = 2.5 \ m/s

    Explanation:

    Given data:

    Height, h = 210 \ m

    Time, t = 6.3 \ s

    Let the initial velocity of the object be u.

    From the kinematic equation,

    h = ut + \frac{1}{2}gt^{2}

    210 = u \times 6.3 + 0.5 \times 9.80 \times (6.3)^{2}

    \Rightarrow \ u = 2.46 \ m/s

    u = 2.5 \ m/s (rounding to tenth place)

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