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12.A 120 g mass has a velocity V (2i+5j) m/ sat a certain instant. Its kinetic energy is:(a) 1.7 J(b) 4.0J (c) 5.0J (d) 6.0 J

Answer»

modules of velocity = √4+25= √29now kinetic energy = 1/2mv*v1/2*120*2917401.7Kgm^2/s^2



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