1,000 kg car is travelling at 6.5 m/s to the North. A 3,500 kg truck is also travelling North at the same velocity. What is the total momentum of the two vehicles? Please answer ASAP

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.