An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at 2.5 m/s in a direction $60 ^ { \circ }$ north of east. How fast was the boy moving just before the collision?

Question

An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at  2.5 m/s in a direction $60 ^ { \circ }$ north of east. How fast was the boy moving just before the collision?

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The Answer of An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at  2.5 m/s in a direction $60 ^ { \circ }$ north of east. How fast was the boy moving just before the collision?

An 80-Kg Man Is Skating Northward and Happens to Suddenly 60∘60 ^ { \circ }60∘

An 80-Kg Man Is Skating Northward and Happens to Suddenly $60 ^ { \circ }$