A car goes from 30 m/s to 20 m/s in 2 seconds. What is the acceleration of the car in m/s2?

Question

A car goes from 30 m/s to 20 m/s in 2 seconds. What is the acceleration of the car in m/s2?

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Verity 3 years 2021-07-29T01:36:20+00:00 1 Answers 6 views 0

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    2021-07-29T01:38:13+00:00

    Answer:

     \boxed{\sf Acceleration \ of \ the \ car = -5 \ m/s^2}

    Given:

    Initial speed (u) = 30 m/s

    Final speed (v) = 20 m/s

    Time taken (t) = 2s

    To Find:

    Acceleration (a) of the car

    Explanation:

    From equation of motion we have:

     \boxed{ \bold{v = u + at}}

    By substituting value of v, u & t in the equation we get:

    \sf \implies 20 = 30  + a(2) \\  \\ \sf \implies 2a + 30 = 20 \\  \\ \sf \implies 2a = 20 - 30 \\  \\ \sf \implies 2a =  - 10 \\  \\ \sf \implies a =  -  \frac{10}{2}  \\  \\ \sf \implies  a =  - 5 \: m {s}^{ - 2}

     \therefore

    Acceleration (a) of the car = -5 m/s²

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )