Physics

Problem

39. A boy of mass

m

and a girl of mass

2 m

are initially at rest at the center of a frozen pond. They push each other so that she slides to the left at speed

v

across the frictionless ice surface and he slides to the right. What is the total work done by the children? (A) mv (B)

m v^{2}

(C)

2 m v^{2}

(D)

3 m v^{2}

(A) mv (B)

m v^{2}

(C)

2 m v^{2}

(D)

3 m v^{2}