Mass A, 2.0kg , is moving with an initial velocity of 7 m/s in the +x-direction, and it collides with mass B,4.0kg , initially moving in the +x-direction. After the collision, the two objects stick together and move as one. What is the change in kinetic energy of the system as a result of the collision, in Joules?
I want to find the total initial kinetic energy, then find final velocity, and then find final kinetic energy. I got the correct answer (-42.47), but find myself unable to reproduce this result. Did I get it correct by accident? I would appreciate if you could please write which formulas should be used and which numbers get plugged in...
I thought initial kinetic energy would be (kinetic energy of object 1 + kinetic energy of object 2), and final velocity would be through (m1*v1 + m2*v2)/m1+m2. I'm pretty sure I should be getting 238 as my initial kinetic energy, but somehow I'm getting 323...why?
Thank you!
1 answer
WAIT! I got it now...made a mistake.........
2 answers