12.) A 4.00 kg puck slides on ice without friction with initial speed 5.00 m/s.

Question

12.) A 4.00 kg puck slides on ice without friction with initial speed 5.00 m/s. It collides ELASTICALLY
with a stationary smaller 1.00 kg puck. After the collision, the pucks move along the same line (one-
dimensional collision). What are the final speeds of the pucks?

A.) Large puck stops, small puck moves forward at 5.00 m/s
B.) Large puck stops, small puck moves forward at speed 20.0 m/s
C.) Large puck moves backward at 2.00 m/s, small puck moves forward at 28.0 m/s
D.) Large puck moves backward at 1.00 m/s, small puck moves forward at 24.0 m/s
E.) Large puck moves forward at 3.00 m/s, small puck moves forward at 8.00 m/s

With Conservation of Kinetic Energy I got
m1(vo,1)^2=m1(vf,1)^2 + m2(vf,2)^2

Since they have to equal I got E. Is this correct?

Explanation / Answer

yups its correct

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