Two hockey players skating on essentially frictionless ice collide head-on. madeleine, of mass 65.0 kg, is moving at 6.00 m/s to the east just before the collision and at 3.00 m/s to the west just after the collision. buffy, of mass 55.0 kg, is moving at 3.50 m/s to the east just after the collision. find buffy's velocity (magnitude and direction) just before the collision.

Explanation:

It is given that,

Mass of Madeleine,

Initial speed of Madeleine, (due east)

Final speed of Madeleine, (due west)

Mass of Buffy,

Final speed of Buffy, (due east)

Let is the Buffy's velocity just before the collision. Using the conservation of linear momentum as :

So, the initial speed of the Buffy just before the collision is 7.13 m/s and it is moving due west. Hence, this is the required solution.

i would like to make dinner for my mom, dad, and sister

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.