1) An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensi

Question

1) An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision? answer is in J

2) A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just after the collision? Answer in m/s

Explanation / Answer

1.

The momentum of the system is conserved, therefore
m1 u1 + m2u2 = m1 v1 + m2 v2
where ui, vi are the initial and final velocities of the mass mi
(subscript i stands for subscript 1 or 2)

Plugging in the numbers:
8

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

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