Question:

A rocket blasts upward with constant acceleration. after 3 seconds its at 77 m. whats the magnitude and speed?

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the answer is: 17m/s*s and 51 m/s but i can't solve how

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  1. d = ½at²

    77 = ½a3²

    a = 2*77/9 = 17.1 m/s²

    v = at = 17.1*3 = 51.3 m/s

    .

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