Question

If 2 bodies a car & a truck are moving in same direction ( no external force is applied ) so how are they moving in same direction because no gravity should be there & if in space they can’t move in same direction they might be footing?

Answer 1

Hi, if some object is at rest and you want to move it. you need to push or apply a force on it to move.
once you push the object, the object starts moving but after some time it comes to stop because of friction.
Object will move in the same direction you pushed them.
same way if 2 bodies a car & a truck is moving in the same direction ( no external force is applied ), they both will keep moving in the same direction as per Newton's first law. if you want to change the direction of car or truck .you need to apply a force or push them in that direction.
( I hope you understand the concept. If you have any more doubts, please make a fresh request.)