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A cart traveling at 2.76 m/s (this movement defines the positive direction) has a head on elastic collision with a 11.3 kg cart traveling at -0.65 m/s. If the final velocity of the first cart is 0.1996 m/s, what is it's mass?

kg?

A cart traveling at 3.37 m/s (this movement defines the positive direction) has a head on elastic collision with a 25.8 kg cart traveling at 1.5 m/s. If the final velocity of the first cart is 1.979 m/s, what is it's mass?

kg?

A cart traveling at 2.03 m/s (this movement defines the positive direction) has a head on elastic collision with a 21.3 kg cart traveling at -0.83 m/s. If the final velocity of the first cart is 0.2944 m/s, what is it's mass?

kg?

A cart traveling at 1.3 m/s (this movement defines the positive direction) has a head on elastic collision with a 10.7 kg cart traveling at 1.89 m/s. If the final velocity of the first cart is 1.687 m/s, what is it's mass?

kg?

A cart traveling at 9.91 m/s (this movement defines the positive direction) has a head on elastic collision with a 14 kg cart traveling at -1.44 m/s. If the final velocity of the first cart is 1.32 m/s, what is it's mass?

kg?

A cart traveling at 3.79 m/s (this movement defines the positive direction) has a head on elastic collision with a 22.8 kg cart traveling at 1.7 m/s. If the final velocity of the first cart is 1.787 m/s, what is it's mass?

kg?