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9 September, 11:51

A phone falls out of your hand. If it hits the ground 1.8 s later how fast was it falling when it hit the ground?

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  1. 9 September, 13:40
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    The acceleration due to gravity is about 9.8 ㎨. This means that the speed increases by 9.8㎧ for every second it falls.

    So after 1.8 seconds its speed will increase by 1.8*9.8=17.64㎧. The phone had no starting speed so it increased to about 17.6㎧.
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