Alab cart with a mass of 15 kg is moving with constant velocity, v, along a straight horizontal track. a student drops a 2 kg mass into it from directly above, and the cart continues moving. which equation best represents the horizontal momentum in this situation? 15vi  + 2vi  = 15vf  + 2vf 15vi  + 2(0)  = 15vf  + 2vf 15vi  + 2(0)  = (15  + 2)vf 15vi  + 2vi  =  (15  + 2)vf

Which of the following are risk factors for emphysema ? correct answer : a and and c          good luck and have a nice benevolentpuppy day! : )

Answer: 1.4 seconds which is the third optionexplanation: current is defined as the flow of charge per timetherefore, the equation that relates current, charge and time can be expressed as follows: i = δq / δtwhere: i is the current given = 1.8 ampereδq is the charge given = 2.5 coulombδt is the time required for the flow of the given charges to give the 1.8 ampere.substitute with the givens in the above equation to get the time as follows: 1.8 = 2.5 / δtδt = 2.5 / 1.8 = 1.38888 which is approximately 1.4 secondshope this was !