Which statement about acceleration is always true? a
Either a change in speed or a change in direction means there is acceleration.
b
Both speed and direction must change for acceleration to occur.
c
The unit m/s is the SI unit o acceleration.
d
For objects to accelerate, they must speed up.

All forces cause motion? true or false

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)