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January 25, 2015

Posted by **Anonymous** on Monday, October 15, 2012 at 5:37pm.

Gayle’s mass is 70.0 kg, the sled has a mass of 2.00 kg, and her brother has a mass of 50.0 kg

- Physics URGENT!!! -
**Elena**, Monday, October 15, 2012 at 6:17pmm=2 kg , m1=70+2=72 kg, m2= 50 kg

v =9 m/s, Δh=4 m, h=20 m

(a)

m1•v =(m1+m)v1

v1= m1/(m1+m)

(b) KE1+ΔPE=KE2

(m1+m)•v1²/2+(m1+m)•g•Δh=(m1+m)•v2²/2

v2=sqrt(v1²+2g•Δh)

(c) (m1+m)•v2= (m1+m2+m) • v3

v3 = (m1+m)•v2/(m1+m2+m)

(d) (m1+m2+m)•v3²/2+ (m1+m2+m)g(h- Δh) = (m1+m2+m)v4²/2

v4=sqrt{ v3²/2+2 g(h- Δh)}.

- Physics URGENT!!! -
**Anonymous**, Monday, October 15, 2012 at 6:58pmCan you give me the values you got so I can check mine?

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