physics momentum

a trolley of mass 200kg is travelling north at 2m\s. It collides head on with a second trolley of mass 500kg which is travelling south with a velocity of 5 m\s and they remain coupled together.
a)calculate the velocity of the two trolleys after collision.
b)what is the direction of motion of the trolley after collison?

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  1. conservation of momentum

    solve for V. A negative N means S

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