What are the advantages and disadvantages of sustainable energy ??

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?