Physics

A 90 kg halfback runs north and is tackled by a 120 kg opponent running south at 4 m/s. The collision is perfectly inelastic. Just after the tackle, both players move at a velocity of 2 m/s north. Calculate the velocity of the 90 kg player just before the tackle.

a.) 3 m/s south
b.) 4 m/s south
c.) 10 m/s north
d.) 12 m/s north

  1. 👍
  2. 👎
  3. 👁
  1. Given

    mA = 90 kg
    MAf = 2 m/s

    mB = 120 kg
    MAi = 4 m/s
    MAf = 2 m/s

    Use the equation:::

    (MA)(VAf) + (MB) (VBf) = (MA)(VAi) + (MB)(MBi)

    If you have any questions, just reply back.

    1. 👍
    2. 👎
  2. north momentums:

    before
    90 v - 120 * 4

    after
    (90+120) * 2

    set those equal and solve for v

    1. 👍
    2. 👎
  3. 10m/s

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A 95 kg halfback makes a turn on the football field. The halfback sweeps out a path that is a portion of a circle with a radius og 12 meters. The halfback makes a quarter of a turn around the circle in 2.1 seconds. Determine the

  2. us history

    Which of these statements best compares the economic development of the North and South during the first half of the 19th century? More factories and railroad lines were built in the North than in the South. The North developed

  3. Physics

    Canadian geese migrate essentially along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 km/h. If one such bird is flying at 100 km/h relative to the air, but there is

  4. Social Studies

    Map of the plan of the city of Philadelphia. The city is largely composed of north south and east west streets intersected at right angles. The Delaware River is to the south. Map of the plan of city of Washington. Streets are

  1. maths

    a train of length 100m runs at a speed of 120km/hr from north to south. another train of length 150m travels with a speed of 80 km/hr from south to north. what is the time required to cross each other ?

  2. Physics

    On a very muddy football field, a 100 kg linebacker tackles an 75 kg halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.5 m/s north and the halfback is sliding with a velocity of 7.5 m/s

  3. physical geography

    How many miles are between the tropics of cancer and capricorn if you travel directly north and south? The Tropic of Cancer and the Tropic of Capricorn each lie at 23.5 degrees latitude. The Tropic of Cancer is located at 23.5°

  4. georgia state history

    Which of the following was an advantage of the south at the beginning of the civil war A. The south had agriculture products to provide food for the army B. The south had many factories that created superior machinery C. The south

  1. pre algebra

    Lilliana is training for a marathon. She runs the same distance every day for a week. On Monday, Wednesday, and Friday, she runs 3 laps on a running trail and then runs 6 more miles. On Tuesday and Sunday, she runs 5 laps on the

  2. Physics URGENT!!!

    A 75.0 kg fullback running east with a speed of 6.00 m/s is tackled by a 82.0 kg opponent running north with a speed of 5.00 m/s. (a) Calculate the velocity of the players immediately after the tackle. (b)Calculate the direction

  3. i.p.c

    An ostrich runs north in a straight line for 21 meters. She then turns around and runs 25 meters back toward her nest (south) on the same path. What is her displacement?

  4. math

    Boris and Stella are running on a circular track which has a radius of 300 meters. They start running at the same time. Boris starts at the northernmost point of the track, and Stella starts at the easternmost point. Boris runs

You can view more similar questions or ask a new question.