A 6 kg mass is released from rest at point A of a circular track of radius R= .4

Question

A 6 kg mass is released from rest at point A of a circular track of radius R= .45m. the mass slides down the track and collides with a 2.3 kg mass that is initially at rest on a horizontal frictionless surface. if the masses stick together what is their speed after the collision. The first mass is at angle 90 degrees away from the mass at rest and travels down the circular path with radius R to make the collision.

I have attempted the problem and got the answer 3.03 m/s which isn't one of the answer choices.
a. 2.1 m/s
b. 2.9 m/s
c. 3.8 m/s
d. 1.7 m/s
e. 3.4 m/s

Explanation / Answer

1. m1=6kg

m2=2.3kg

R=.45m

2. U=K      m1v=(m1+m2)V

mgR=.5mv2

v=√(2*g*R)

3. Do proper subsitutions and you should have the answer. Good luck

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