PHYSICS

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Starting from a pillar, you run a distance 200 m east (the + x-direction) at an average speed of 5.0 m/s, and then run a distance 280 m west at an average speed of 4.0 m/s to a post.


Q: Calculate your average velocity from pillar to post.

  • PHYSICS -

    Total distance = 200-280=-80
    Total time = 200/5 + 280/4 seconds
    = 110 seconds
    Calculate the average velocity using
    average velocity
    = total distance / total time
    Watch the sign of all quantities.

  • PHYSICS -

    -0.727

  • PHYSICS -

    Calculate the horizontal force required to accelerate a 20 kg grocery cart from rest to .50 m/s in 2 s.

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