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8- A girl of mass 35 kg site on trolley of mas 5kg.initial velocity of trolley is im/s Come to rest after travelling 16m.find work done on trolley.come to meet after thavelling 16 m(a) work done ou trolley(b) work done by girl |
Answer» <html><body><p><strong>Answer:</strong></p><p>Given:</p><p></p><p>Mass of girl = 35 kg</p><p></p><p>Mass of <a href="https://interviewquestions.tuteehub.com/tag/trolley-1427873" style="font-weight:bold;" target="_blank" title="Click to know more about TROLLEY">TROLLEY</a> = 5 kg</p><p></p><p>Total mass, m = (35 + 5) = 40 kg</p><p></p><p> u = 4 m/s</p><p></p><p>v = 0</p><p></p><p>s = 16 m</p><p></p><p>By equation,</p><p></p><p>v <a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a> = u 2 + 2as</p><p></p><p>0 = (4)2 + 2a (16)</p><p></p><p>32a = –16</p><p></p><p>a = –0.5 m/s2</p><p></p><p>Force exerted on trolley,</p><p></p><p>F = ma</p><p></p><p> = 40 × 0.5 = 20 N</p><p></p><p> </p><p></p><p>Work <a href="https://interviewquestions.tuteehub.com/tag/done-2591742" style="font-weight:bold;" target="_blank" title="Click to know more about DONE">DONE</a> on trolley W = FS = 20 N <a href="https://interviewquestions.tuteehub.com/tag/x-746616" style="font-weight:bold;" target="_blank" title="Click to know more about X">X</a> 16 m</p><p></p><p> = 320 J</p><p></p><p>Work done by the girl, W = FS</p><p></p><p> = mass of girl × retardation × S</p><p></p><p> = 35 × 0.5 × 16</p><p></p><p> = <a href="https://interviewquestions.tuteehub.com/tag/280-299547" style="font-weight:bold;" target="_blank" title="Click to know more about 280">280</a> J</p><p></p></body></html> | |