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In an ice show a 65.0 kg skater leaps into the air

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Answer #1

(a) required velocity = [65/(65+70)] x 4

                                 = 1.925 m/s

(b) energy loss =1/2(mv2-Mv2)

=1/2[(80x4x4)-(135x1.925x1.925)]

= 389.87 J

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