Two frictionless lab carts start from rest and are pushed along a level surface by a constant force. Students measure the magnitude and duration of the force on each cart, as shown in the partially completed data tableabove, and calculate final kinetic energy and momentum. Which cart has a greater kinetic energy at the end of the push?

The first cart has greater kinetic energy.

Explanation:

The mass of the second cart is 2kg, and its momentum is 10kg m/s ;therefore, it must be that

which gives

.

Then the kinetic energy of 3kg cart is

which is less than that of the 1kg cart ; therefore, the 1st cart has greater kinetic energy.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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