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400 = 1/2 mv0²
v0² = 800/m
v0 = 20√(2/m) m/s
Benda bergerak dgn lintasan parabola (buat ilustrasinya).
Pada saat mencapai titik tertinggi, vy= 0 dan vx= [email protected]
vx = 20√(2/m) cos60
vx= 10√(2/m)
Ek di titik tertinggi
Ek= Ekx + Eky
Karena vy= 0, maka
Ek = Ekx
= 1/2 m vx²
= 1/2 m (10√(2/m))²
= 100J