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A cart traveling at 6.93 m/s (this movement defines the positive direction) has a head on elastic collision with a 26.9 kg cart traveling at 0.36 m/s. If the final velocity of the first cart is -2.546 m/s, what is it's mass?

kg?

A cart traveling at 6.75 m/s (this movement defines the positive direction) has a head on elastic collision with a 42.2 kg cart traveling at 1.41 m/s. If the final velocity of the first cart is 1.165 m/s, what is it's mass?

kg?

A cart traveling at 7.22 m/s (this movement defines the positive direction) has a head on elastic collision with a 13.9 kg cart traveling at 6.45 m/s. If the final velocity of the first cart is 6.726 m/s, what is it's mass?

kg?

A cart traveling at 3.92 m/s (this movement defines the positive direction) has a head on elastic collision with a 33.1 kg cart traveling at 7.49 m/s. If the final velocity of the first cart is 6.896 m/s, what is it's mass?

kg?

A cart traveling at 9.58 m/s (this movement defines the positive direction) has a head on elastic collision with a 36.8 kg cart traveling at 4.92 m/s. If the final velocity of the first cart is 1.026 m/s, what is it's mass?

kg?

A cart traveling at 5.39 m/s (this movement defines the positive direction) has a head on elastic collision with a 11.5 kg cart traveling at 5.37 m/s. If the final velocity of the first cart is 5.38 m/s, what is it's mass?

kg?