Where do most typical exhaust leaks
occur?

an exhaust leak is most likely in your systems manifold or any of the joints along the exhaust system if the leak is the manifold not only will your engine volume increase. but some of them can be located and a running vehicle in the engine bay

Explanation:

lol hope it helps^^ I'm no expert but I'm just giving info

the answer is b, have negligible mass

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.