Conservation of Momentum. Grade 9 lesson.

Conservation of Momentum

1. SOLVE!! Two ice skaters stand together. They boy pushes the girl with a speed of +0.50 m/s and the girl pushes the boy in opposite direction with a speed of -0.65 m/s. If the mass of the boy is 50 kg, what is the girl’s mass? (Consider the ice to be frictionless.) Two carts are stationary at the beginning. If the cart having 10kg mass starts to move to the east with a velocity of 5m/s, find the cart’s speed having mass 4kg with respect to the ground.