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80=½[10]t²
80=5t²
t=√80/5
=√16 =4s
Y=Vo [email protected] - ½ gt²
80=30 sin a [4] - ½ [10] 4²
80=120 [email protected] - ½[160]
80=120 sin @ - 80
120 sin @ = 0
sin @ =0
@ = 0°
Vx= Vo cos 0°
= 40 × 1
=40 m/s