In which situation is an object accelerating? a. a rock has a constant velocity of 0 m/s. b. a motorcycle is parked on the side of the street. c. a leaf's velocity remains 1 m/s as it falls from a tree. d. a bicyclist's velocity changes from 2 m/s to 5 m/s as she travels down the street.

Suppose a pair of chemical compounds a and b can react in two different ways: a + b -> c reaction 1 gives product c. a + b -> d reaction 2 gives product d. the following facts are known about the two reactions: . reaction 1 is endothermic and reaction 2 is exothermic. if a reaction vessel is charged (filled) with a and b , then at first d is produced faster than c. use these facts to sketch a qualitative reaction energy diagram for both reactions. note: because these sketches are only qualitative, the energies don? t have to be exact. they only have to have the right relationship to each other. for example, if one energy is less than another, that fact should be clear in your sketch.