1. At the starting gun a runner accelerates from rest at 2.0 m/s2 for 2.2 s. What is the runners speed 1.2 s after she starts running?

Question

1. At the starting gun a runner accelerates from rest at 2.0 m/s2 for 2.2 s. What is the runners speed 1.2 s after she starts running?

2. A skier starts from rest and accelerates down a slope at 2.2 m/s2 . How much time is required for the skier to reach a speed of 9.0 m/s ?

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RI SƠ 8 months 2021-07-18T00:03:37+00:00 1 Answers 3 views 0

Answers ( )

    0
    2021-07-18T00:05:19+00:00

    Explanation:

    1. Given:

    v₀ = 0 m/s

    a = 2.0 m/s²

    t = 1.2 s

    Find: v

    v = at + v₀

    v = (2.0 m/s²) (1.2 s) + 0 m/s

    v = 2.4 m/s

    2. Given:

    v₀ = 0 m/s

    v = 9.0 m/s

    a = 2.2 m/s²

    Find: t

    v = at + v₀

    9.0 m/s = (2.2 m/s²) t + 0 m/s

    t ≈ 4.1 s

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