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Velocity in vertical direction = 17sin72 =16.1679 m/sec.
When ball reaches maximum height, velocity in vertical direction becomes zero.
Using v = u-gt, we get 0 = 16.1679 - 9.8t
Or, t = 16.1679/9.8 = 1.649, say, 1.65secs
Hence, ball reach maximum height in 1.65 secs. Ans.
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