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Two playful birds collide when they are at the top of their own trajectories and stick...

Two playful birds collide when they are at the top of their own trajectories and stick together, stay tight thereafter. The first bird is a strong beast of mass m1 = 300 g initially moving east with a velocity of v1 = 25 cm/s , while the second bird is a frail creature of mass m2 = 190 g initially moving west with a velocity of  v2 = 60 cm/s

a)Find the kinetic energy change due to the collision?

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