Ok I am stumped on these 2 questions.

A thread holds a 1.5-kg and a 4.50-kg cart together. After the thread is burned, a compressed spring pushes the carts apart, giving the 1.5 kg cart a speed of 32 cm/s to the left. What is the velocity of the 4.5-kg cart?

So far my givens are

Mass A= 1.5 kg

Mass B= 4.50 kg

Velocity A= 32 cm/s

Velocity B= X

How am I supposed to find the answer with only thoose givens using the law of conservation of momentum equations? I'm not sure what the velocity final is for either one. I'm really confused.

As for the second question. I have the same problem

Carmen and Judi dock a canoe. 74.0-kg Carmen moves forward at 4.0 m/s as she leaves the canoe to step onto the dock. At what speed and in what direction do the canoe and Judi move if their combined mass is 115 kg? (Use a positive number if the canoe moves away from Judi.)

Givens:

Mass A= 74 kg

Velocity A= 4.0 m/s

Mass B= 115 kg? (not sure about this one)

Velocity B= X?

This question I am totally clueless as well and would love if someone could point me in the right direction.

Equations:

Ma(Va)+Mb(Vb)= Ma(Vaf)+Mb(Vbf) Elastic equation

Ma(Va)+Mb(Vb)= (Ma+Mb)Vf Inelastic Equation