Question

A 0.016 kg marble sliding to the right at 24.2
cm/s on a frictionless surface makes an elas-
tic head-on collision with a 0.016 kg marble
moving to the left at 20.3 cm/s. After the
collision, the first marble moves to the left at
20.3 cm/s. Find the velocity of the second marble after the collision. Answer in units of m/s
What is the total kinetic energy before the
collision? Answer in units of J
What is the total kinetic energy after the collision?
Answer in units of J

Answer 1

Well I started by converting cm.s to m/s then since all the masses are all the same i cancelled them out... and used .24+.203 = 20.3 + vF and solved for vF... what did i do wrong?

Answer 2

the second part is just 1/2 mv^2 i just need the velocity from the first part of the problem right?

Answer 3

is this linear momentum?

Answer 4

yes