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| 1. |
Two particles of masses m1 and m2 initially at rest start moving towards each other under mutual force of attraction. The speed of the centre of mass at any time t when they are at a distance r apart, is : |
| Answer» <p class="MsoNormal" style="text-align: justify;"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif"><strong>Correct option (d) Zero</strong></span></span></p><p class="MsoNormal" style="text-align: justify;"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif"><strong>Explanation:</strong></span></span></p><p style="text-align: justify;"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif">The centre of mass will not move, because there is no external force. There is a force of mutual attraction under which centre of mass will not shift. Hence, speed of centre of mass is zero.</span></span></p> | |