Posted by Megan on Wednesday, October 17, 2012 at 12:54pm.
Ann, a 66.1 kg person throws a 0.0460 kg snowball forward with a ground speed of 31.7 m/s. Billy, with a mass of 60.5 kg, catches the snowball. Both people are on skates. Ann is initially moving forward with a speed of 2.29 m/s, and Billy is initially at rest. After the snowball is exchanged (a) What is Ann’s velocity? (b) What is Billy’s velocity? Disregard friction between the skates and the ice.

Physics  Elena, Wednesday, October 17, 2012 at 3:01pm
m1=66.1 kg, v1=2.29 m/s
m2=0.046 kg, v2= 31.7 m/s
m3=60.5 kg, v3=0
u1=? u3=?
The law of conservation of linear momentum
(m1+m2) •v1 =m1•u1 +m2•v2
u1= [(m1+m2) •v1 m2•v2]/m1 =
=[(66.1+0.046) •2.29 – 0.046•31.7]/66.1 = 2.269 m/s
m2•v2=(m2+m3) •u3
u3= m2•v2/(m2+m3) =
=0.046•31.7/(0.046+60.5)=0.024 m/s

Physics  Ana, Monday, February 24, 2014 at 10:46pm
I got the correct answer for the thrower, but for the catcher to find the second velocity, I follow the formula but it still counts it as wrong. What could I be doing wrong?
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