Object A has mass mA = 9 kg and initial momentum A,i = < 21, -5, 0 > kg m/s, jus

Question

Object A has mass mA = 9 kg and initial momentum A,i = < 21, -5, 0 > kg m/s, just before it strikes object B, which has mass mB = 11 kg. Just before the collision object B has initial momentum B,i = < 6, 7, 0 > kg m/s.


After the collision, what was the magnitude of the momentum of object A?

After the collision, what was the kinetic energy of object A?

After the collision, what was the magnitude of the momentum of object B?

After the collision, what was the kinetic energy of object B?

Explanation / Answer

Before the collision, the magnitude of the momentum of object A = sq. root [21^2 + (-5)^2 + 0^2] kg.m/s = 21.59 kg.m/s Kinetic energy = (1/2) mv^2 = (1/2) m^2v^2 / m = p^2/2m where p =magnitude of momentum. K.E. = (21.59)^2 / (2x9) J = 25.89J Before the collision, the magnitude of the momentum of object B = sq. root [6^2 + (7^2 + 0^2] kg.m/s = 9.22kg.m/s Kinetic energy = (1/2) mv^2 = (1/2) m^2v^2 / m = p^2/2m where p =magnitude of momentum. K.E. = (9.22)^2 / (2x11) J = 3.86J

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.