Cart a and cart b are moving toward each other. they collide and come to rest at the point of impact. from this observation, we can conclude that the carts
have equal masses
were moving with equal and opposite momentum
were moving with equal and opposite velocities
were moving with equal kinetic energies

were moving with equal and opposite momentum

Explanation:

As we know that in all collision net external force on the system of two masses will be ZERO

so we can use momentum conservation

if we have

F = 0

so we have

so correct answer will be

were moving with equal and opposite momentum

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.