Objectives Pecina y 01:Posttest 01:Motion Along a Straight Line eration 1. An elevator moving down passes its

Question

Objectives
Pecina
y
01:Posttest 01:Motion Along a Straight Line
eration
1. An elevator moving down passes its neighbor, an elevator moving up. Their speed relative to one another is 8 m/s. What is the velocity of each
elevator relative to someone standing on the first floor? Assume that the elevators are traveling at the same speed, and that the upward direction is
positive.
tant Acceleration
O Both elevators are moving at 8 m/s.
y Falling Objects
O One elevator is moving at 4 m/s; the other elevator is moving at -4 m/s.
O Both elevators are moving at 4 m/s.
tive Velocity
O One elevator is moving at 8 m/s; the other elevator is moving at -8 m/s.
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on in a Plane
ton’s Laws of Motion
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11:53 PM
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Thiên Di 5 years 2021-09-03T18:11:29+00:00 1 Answers 12 views 0

Answers ( )

  1. Gerda
    0
    2021-09-03T18:13:20+00:00
    Reply

    Answer:

    B

    Explanation:

    Given that an elevator moving down passes its neighbor, an elevator moving up. Their speed relative to one another is 8 m/s. What is the velocity of each elevator relative to someone standing on the first floor? Assume that the elevators are traveling at the same speed, and that the upward direction is

    positive.

    Solution

    Given that upward direction is positive, then, the downward direction will be negative.

    To get a relative velocity of 8m/s

    4 – ( – 4 ) = 8

    Therefore, the correct answer will be

    One elevator is moving at 4 m/s; the other elevator is moving at -4 m/s

    Which is option B

    Because the negative multiply by negative sign will give positive sign.

    Given

    4 + 4 = 8.

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