Weegy: To every action there is always an equal and opposite reaction: or the forces of two bodies on each other are always equal and are directed in opposite directions. User: An object with a mass of 90 grams, moving at a constant velocity of 6 meters per second, has __________. Weegy: Momentum is the answer. Here is an example.
Example: Object 1 (mass is 6 kg), moving along with a velocity of 10 m/s, collides with Object 2 (mass is 3 kg), moving along with a velocity of 5 m/s. [ If object 1’s velocity is decreased to 4 m/s by the collision, what will object 2’s velocity be after the collision?
G: Before collision: m(1) = 6 kg, v(1) = 10 m/s, m(2) = 3 kg, v(2) = 5 m/s
After the collision: the masses are the same, but v(1)! = 4 m/s and v(2)! = ?
[Note: the ! symbol means a new value for the same variable]
F: the second object's velocity after the collision
E: p(1)Before + p(2)Before = p(1)After + p(2)After .
and so
m(1) * v(1) + m(2) * v(2) = m(1) * v(1)! + m(2) * v(2)!
S: Step1 6 kg * 10 m/s + 3 kg * 5 m/s = 6 kg * 4 m/s + 3 kg * v(2)!
To simplify this long equation’s substitution, look at the following steps:
Step2 60 kg m/s + 15 kg m/s = 24 kg m/s + 3 kg * v(2)!
Step3 75 kg m/s = 24 kg m/s + 3 kg * v(2)!
Step4 75 kg m/s – 24 kg m/s = 3 kg * v(2)!
Step5 51 kg m/s = 3 kg * v(2)!
Step6 51 kg m/s / 3 kg = v(2)!
A: v(2)! = 17 m/s
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