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    				| 1. | 4. A particle of mass 2 kg moves on a circular path with constant speed 10 m/s. Find change in speedmagnitude of change in velocity. When particle corupletes half revolution. | 
| Answer» After completing half revolution, particle speed remains constant so change in speed will be 0 m/sec, but there is change in velocity vector... Both have same magnitude but opposite directions, so magnitude of change in velocity will be 20 m/sec | |