A2.9-kg cart is rolling along a frictionless, horizontal track towards a 1.4-kg cart that is held initially at rest. the carts are loaded with strong magnets that cause them to attract one another. thus, the speed of each cart increases. at a certain instant before the carts collide, the first cart's velocity is +3.9 m/s, and the second cart's velocity is -1.2 m/s. (a) what is the total momentum of the system of the two carts at this instant? (b) what was the velocity of the first cart when the second cart was still at rest?

9.63 kg m/s

3.32 m/s

Explanation:

= Mass of first cart = 2.9 kg

= Mass of second cart = 1.4 kg

= Velocity of first cart = 3.9 m/s

= Velocity of second cart = -1.2 m/s

Total momentum of the system

The total momentum of the system is 9.63 kg m/s

Equating the same equation with

The velocity of the first cart when the second cart was still at rest is 3.32 m/s

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

friction

explanation:

they us to move forward and backwards