An observer in the earth reference frame observes cart a and cart b moving toward each other with the same speed until they collide and come to rest. consider this event as seen by observer a moving along with cart a. assume that this observer matches cart a's initial velocity but does not collide with cart b (that is, observer a continues along at the same velocity that cart a had initially). would the observer in the earth reference frame and observer a obtain the same value for the initial velocity of cart a? yes no would the observer in the earth reference frame and observer a obtain the same value for the final velocity of cart b after the collision? no yes would the observer in the earth reference frame and observer a obtain the same value for the relative velocity of the two carts after the collision?