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Twins are sliding a rock back and forth on a frozen lake with negligible friction. The...

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Physics

Twins are sliding a rock back and forth on a frozen lake withnegligible friction. The mass of each child is 21.0 kg and the massof the rock is 2.6 kg. Each time the rock is given a push by thechild who just caught it, it leaves the hand with a speed of 1.8m/s relative to the child's hand.


A. The twins are intitially at rest and the sister first slides therock toward her brother in the positive direction. What is thespeed of the sister after she releases the rock?
m/s
B. The brother receives the rock. What is his velocity after he hasreceived it?
m/s
C. The brother then slides the rock to his sister. What is hisvelocity after he releases the rock?
m/s
D. The sister catches the rock. What is her velocity now?
m/s
E. Can the game go on forever?

a.) no

b.) Cannot be determined    

c.) yes

Answer & Explanation Solved by verified expert
3.7 Ratings (657 Votes)
A For the sister m mass of the rock 26 kg vrs velocity of rock relative to sister 18 ms vrg velocity of rock relative to ground vsg velocity of sister relative to ground M mass of sister 21 kg we know that vrs vrg vsg 18 vrg vsg vrg 18 vsg Using the conservation of energy    See Answer
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