Una bola de 0.3 kg tiene una colisión elástica frontal con una segunda bola que inicialmente esta en reposo. La segunda bola se aleja con la mitad de la rapidez original de la primera bola a) Cual es la masa de la segunda bola?
b) Que fracción de la energía cinética inicial se transfiere ala segunda bol

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when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

conservation of mass

mass before something happens = mass afterwards

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.