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21 January, 12:21

An object is launched straight up into the air with an initial velocity of 40 meters per second, from a height 30 m above the ground. How many seconds later will the object hit the ground?

Enter your answer as a number rounded to the nearest tenth, such as: 42.5

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  1. 21 January, 13:25
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    8.8 seconds

    Step-by-step explanation:

    Taking g = 9.81 m/s²

    Convention: downwards positive

    30 = - 40t + 0.5 (9.81) t²

    4.905t² - 40t - 30 = 0

    t = 8.846327763, - 0.6913838279

    t = 8.8s
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