Recall the portion of the video in which the girl pushes her brother on the sled at constant velocity. the pushing force she exerts on the sled is the frictional force the ground exerts on the sled.
a) less than
b) equal to
c) greater than

option (b) is correct.

Explanation:

As the sled is moving with constant velocity, it means the net force on the sled is zero. It shows that the net force on the sled is zero and hence the applied force is equal to the friction force acting on the sled.

Option (b)

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.