Which chemical reaction absorbs energy? A. photosynthesis B. explosion C. current produced by a battery D. combustion of fuels E. activated hand warmers

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?