A 2.5-kg mass A travels in the -x direction. A 3-kg mass B traveling in the x direction at 2 m/s is involved in a collision with mass A. After the collision both masses stick together and have a velocity of 1 m/s in the -x direction; from this, the initial speed of mass A is
A) 0.2 m/s.
B) 2.1 m/s.
C) 0.09 m/s.
D) 4.6 m/s.

Question

Quizplus · Accepted Answer

Explanation:Momentum before collision = Momentum after collision(2.5 kg)(-v) + (3 kg)(2 m/s) = (5.5 kg)(1 m/s)-2.5v + 6 = 5.5-2.5v = -0.5v = 0.2 m/s

A 25-Kg Mass a Travels in the -X Direction