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27 February, 18:32

The initial speed of a body is 2.98 m/s. What is its speed after 1.6 s if it accelerates uniformly at 2.51 m/s^2?

Answer in units of m/s

What is its speed after 1.6 s if it accelerates uniformly at - 2.51 m/s^2?

Answer in units of m/s

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Answers (2)
  1. 27 February, 18:51
    0
    V (ending) = at + v (initial)

    V = (-2.51) (1.6) + 2.98

    V = - 1.036 m/s

    V (using significant figures) = - 1.0 m/s
  2. 27 February, 20:53
    0
    Not sure if you are saying the acceleration is positive or negative?

    The equation you would use would be v=u+at, where v=final velocity u=initial velocity a=acceleration t=time. Using this if the acceleration is 2.51m/s^2:

    v=2.98 + (2.51*1.6)

    v=6.996m/s

    If the acceleration is - 2.51 m/s^2:

    v=2.98 + (2.51*1.6)

    v=-1.036m/s
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