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14 May, 07:01

Xavier throws a tennis ball to his friend Olaf at a 20° angle relative to the ground with an initial velocity of 18 m/s. The tennis ball travels 30 m until Olaf catches it. The time the tennis ball was in the air, rounded to the nearest hundredth, is s.

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  1. 14 May, 10:24
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    Horizontal component of velocity = 18cos20

    = 16.9ms-1

    As horizontal velocity is constant:

    Time = distance / velocity

    t = 30 / 16.9

    t = 1.78s
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