With what velocity a ball be projected vertically so that the distance

1.	With what velocity a ball be projected vertically so that the distance covered by it in 5th second is twice the distance it covers in its 6th second (? = 10 ?/?8) a) 58.8 ?/? b) 49 ?/? c) 65 ?/? d) 19.6 ?/?
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With what velocity a ball be projected vertically so that the distance covered by it in 5th second is twice the distance it covers in its 6th second (? = 10 ?/?8) a) 58.8 ?/? b) 49 ?/? c) 65 ?/? d) 19.6 ?/?

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With what velocity a ball be projected vertically so that the distance covered by it in 5th second is twice the distance it covers in its 6th second (? = 10 ?/?8) a) 58.8 ?/? b) 49 ?/? c) 65 ?/? d) 19.6 ?/?​

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With what velocity a ball be projected vertically so that the distance covered by it in 5th second is twice the distance it covers in its 6th second (? = 10 ?/?8) a) 58.8 ?/? b) 49 ?/? c) 65 ?/? d) 19.6 ?/?