Tom and ted are sitting on separate chairs that have wheels. tom pushes ted and, in turn, he starts moving too. in which direction does tom move?

They move in opposite directions.

Explanation:

As we know that they both apply force on each other and here they have no external force on them

So here we can say that

now we will have

now we can say

so we have

so here both have equal and opposite momentum so then both will move in opposite direction to each other

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.