An object with more mass has more kinetic energy than an object with less mass, if both objects are moving
OA) at the same speed
OB) in the same direction
OC) in opposite directions

Explanation:

The kinetic energy of an object is given in terms of its mass and object as :

An object with more mass has more kinetic energy. An object with less  mass, if both objects are moving at the same speed, in opposite directions, will have less kinetic energy. The square of v will give positive number.

if they have a finite resultant

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.