Two carts, labeled A and B, roll toward each other with negligible friction and collide on a horizontal track. For the purposes of this question, the positive direction points to the right. Cart A begins with a velocity of v0A = 2.4 meters per second and Cart B begins with a velocity of v0B = -1.4 meters per second.  Cart A has a mass of mA = 1.2 kg and Cart B has a mass of mB = 2.8 kg. The two carts have a completely elastic collision. Calculate the change in momentum (in units of kg m/s) of Cart A during the collision, The sign, positive or negative, is important.

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