A-Level Maths: Q5-15 Projectiles: From a Height Example 2 Integration Method

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I can do this question the SUVAT method but not that method. Is it okay if I just stick to the SUVAT method when it comes to answering those questions?

nickquick
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How comes for the displacement vector you have not included the constant 0.05 for the j component? i.e. (-4.9t^2 +0.05) j

gunnerboy
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Well, wouldn't the solution for part B technically be 1.768... since we figured out in part A the j component would be equal to -0.05m because -4.9t^2+x=x-0.05 which should give 18t-0.05=1.7682... which would still round up to 1.8 to 2 significant figures, why would we not take into account the j component?

andygames