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Home Q & A Board Science-Related Homework Help Physics
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fionacurley fionacurley
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11 years ago
A 40-kg projectile leaves a 2000-kg launcher with a velocity of 800 m/s forward. What is the recoil velocity(speed and the direction) of the launcher
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#1
11 years ago
It's conservation of momentum. Initial momentum=Final momentum. Momentum=mass times velocity, so this equation is:

(m1)(v1initial)+(m2)(v2initial) = (m1)(v1final) + (m2)(v2final)

Make m1=40kg, m2=2000kg, v1final=800m/s. v1initial=0 because the projectile is initially at rest. Then solve for v2final, it should be negative.
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FirasFiras
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11 years ago
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