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Q6. A 120 g mass has a velocity = 21+5mis at a certain instant. Its kinetic energy is 1.3 joule2.4 joule3.5 joule4.1.74 joule​

Answer»

tion:Here, m=120g=120×10 −3 kg=0.12 kg V =2 i^ +5 j^ ms −1 ∴v 2 = v . v =(2 i^ +5 j^ ).(2 i^ +5 j^ ) =4+25=29 m 2 s −2 KINETIC energy, K= 21 m.v 2 = 21 ×0.12 kg×(29 m 2 s −2 )=1.74 J.



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