Me the velocity of an object increases from -10m/s to -15m/s in 2.0s what is the average acceleration of the object? -2.5m/s^2 +2.5m/s^2 +12.5m/s^2 -12.5m/s^2

A75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high-efficiency motor that has an efficiency of 95.4 percent. the motor operates 4368 hours a year at a load factor of 0.75. taking the cost of electricity to be $0.12/kwh, determine the amount of energy and money saved as a result of installing the high-efficiency motor instead of the standard motor. also, determine the simple payback period if the pu