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At the lowest point of the swing the tension in the string is made up of weight of the ball mg and the centripetal force mV1^2 r. 1.254 mg mV1^2 r V1^2 m (1.254 0.047 x 9.8 x 1.31 1.03935 Kinetic energy at the lowest point is mV1^2 2 0.5196 J At the second swing the kinetic energy becomes mV2^2 2 (100 6.3)x 0.5196 100 0.487 J V2^2 =0.487 x 2 0.047 20.27 The ball's speed at the lowest point on the second swing is V2 4.552 m/s
Wed, 10 Mar 2010 10:46:10 GMT