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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» <html><body><p>tion:Here, m=120g=120×10 −3 kg=0.12 kg <a href="https://interviewquestions.tuteehub.com/tag/v-722631" style="font-weight:bold;" target="_blank" title="Click to know more about V">V</a> =2 i^ +<a href="https://interviewquestions.tuteehub.com/tag/5-319454" style="font-weight:bold;" target="_blank" title="Click to know more about 5">5</a> j^ ms −1 ∴v 2 = v . v =(2 i^ +5 j^ ).(2 i^ +5 j^ ) =4+25=<a href="https://interviewquestions.tuteehub.com/tag/29-299821" style="font-weight:bold;" target="_blank" title="Click to know more about 29">29</a> m 2 s −2 <a href="https://interviewquestions.tuteehub.com/tag/kinetic-533291" style="font-weight:bold;" target="_blank" title="Click to know more about KINETIC">KINETIC</a> energy, K= 21 m.v 2 = 21 ×0.12 kg×(29 m 2 s −2 )=1.74 J.</p></body></html>


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