14. A 5,000 kg train is traveling at a velocity of 100 m/s and hits another train. The two trains stick together, and the new velocity is 50 m/s. What is the mass of the second train?

A. 15.000 kg
B. 8.000 kg
C. 5,000 kg
D. 10.000 kg

Please help ASAP

C

Explanation:

                                                    = (5000 kg)·(100 m/s)

                                                    = 500,000 kg·m/s.

                          5000+M) kg)·(50 m/s) = 500,000 kg·m/s

         Dividing by 50 m/s and subtracting 5000 kg, we have ...

                                          (5000 +M) kg = 10,000 kg

                                                        M kg = 5000 kg

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

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