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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Identical twins, each with mass 55.0 kg, are on ice skates and at rest on a frozen lake, which may be taken as frictionless. Twin A is carrying a backpack of mass 12.0 kg. She throws it horizontally at 3.00 m/s to Twin B. Neglecting any gravity effects, what are the subsequent speeds of Twin A and Twin B?

To determine
The subsequent speed of Twin A and Twin B.

Explanation

Conservation of momentum when Twin A tossing the pack is,

mAvAf+mpackvpack=(mA+mpack)(0)=0vAf=mpackvpackmA

Substitute 12.0kg for mpack , 55.0kg for mA and 3.00m/s for vpack .

vAf=(12.0kg55.0kg)(3.00m/s)=0.655m/s|vAf|=0

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