Can Mindfulness be both formal or informal?

Explanation:

mindfulness, it conjures up images of sitting for hours in silent meditation. While formal sitting meditation is one way of practicing mindfulness, there are many formal and informal ways people can use to integrate mindfulness into their lives in order to reap the health benefits

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.