a car is traveling at 20m/s along a road. a child runs out into the road 50 m ahead and the car driver steps on the break. what must the car

Question

a car is traveling at 20m/s along a road. a child runs out into the road 50 m ahead and the car driver steps on the break. what must the car’s decelaration be if the car is to stop just before it reaches the child.

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Adela 5 months 2021-09-03T21:48:28+00:00 1 Answers 0 views 0

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    2021-09-03T21:50:16+00:00

    Answer:

    4 m/s²

    Explanation:

    v {}^{2}  =  {u}^{2}  + 2as \\ 0 {}^{2} =  {20}^{2}   + 2a(50) \\ a =  - 4ms {}^{ - 2}

    Therefore, deceleration = 4 m/s²

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