Physics

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starting from ypur house, run 2oom east at an average speed of 4m/s, then turn around and run 280m west at an average spped of 7m/s to a post.
1) calculate Average velocity from house to post

  • Physics -

    Average velocity=final displacement/total time taken
    Final displacement = 280-200 = 80 m,
    t1=s1/v1=200/4=50 s,
    t2=s2/v2 = 280/7 =40 s.
    total time =50+40 =90 s.
    Average velocity = 80/90=0.89 m/s.

    Note!
    Average speed=total distance travelled/ total time taken=(200+280)/90=5.33 m/s

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