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Acceleration in 2D

An object is ...

Question

An object is projected with velocity $_{0} = 15^i + 20^j$ . Considering x along horizontal axis and y along vertical axis. Find its velocity after $2 s$ .

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Solution

${\to v}_{0} = 15^i + 20^j$
$v_{0 x} = 15 m / s$
$v_{0 y} = 20 m / s$
after time $t = 2 s e c$
$v_{y} = v_{o y} - g t = 20 - 2 \times 10 = 0 m / s$
$v_{x} = v_{o x} = 15 m / s$
so velocity after $2$ sec $= 15^i + 0^j$

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