What is the definition of energy stored in chemical bonds of molecules?

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?