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y= 1/2 gt²
1= 5t²
1/5= t²
t= 1/√5 s
Vy= 2√5 ms-1
Vx= 2 ms-1
V= √(Vx² + Vy²) =√(20+4) = √24
Ek= 1/2. m. V²= 1/2. 1. 24= 12 J