Two magnets are sliding towards each other. one of the magnets, which has a mass of 125 grams, is moving in the positive x-direction at a speed of 7.33 m/s. the other magnet, which has a mass of 85.0 grams, is moving in the negative x-direction at a speed of 11.9 m/s. when they collide, they bind together and move as a single unit. what is the velocity of this single unit immediately after the collision?

0.45 m/s in the negative x-direction

Explanation:

From the law of conservation of momentum, the sum of initial momentum equals the sum of final momentum

Momentum, p=mv where m is the mass and v is the velocity

where is the common velocity, and are velocities of magnet moving in positive x-direction and magnet moving in negative x-direction respectively, and are masses of magnet moving in positive x-direction and magnet moving in negative x-direction respectively.

Substituting 125 g for and 85 g for , 7.33 m/s , -11.9 m/s for then

Therefore, the velocity of single unit is 0.45 m/s in the negative x-direction

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

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