3. The motion of the ball at the right is called

4.Compared to the ball on the left, the ball on the right will hit the ground

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.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it