Q67. Two railway trucks of masses m and 3m move towards each other in opposite directions with speeds 2v and v respectively. These trucks collide and stick together. What is the speed of the trucks after the collision? Physics — Forces and Motion — Question 67 of 419A. v/4B. v/2C. vD. 5v/4Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →