The motion of a car on a position-time graph is represented with a horizontal line. What does this indicate about the car’s motion? A.
It’s not moving.
B.
It’s moving at a constant speed.
C.
It’s moving at a constant velocity.
D.
It’s speeding up.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

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.