A 500 kg freight car rolls to the right and collides with a 10,000kg freight car sitting at rest on a track. The cars connect as they collide and move to the right together at a speed of 2m/s. what was the initial speed of the 500 kg car ? [neglect friction]​

v 154.9= 0.9 length length s little over 154.9cm

+15-35=-20

going in opposite directions

the moving of the box is a result of centripetal force. think of that  as a car or a truck in this case creates a turn, the force of friction performing upon the turned wheels of the car runs centripetal force obligatory for circular motion for the things inside it.