A Velocity Vector represents the rate of change of the position of an object. The Magnitude of a Velocity vector gives the speed of an object while the vector direction gives its direction.
B. Endorphins are released during exercise
First convert mL into liters:
1 L = 1000 mL
250 mL / 1000 = 0.25 L
M = n / V
M = 0.70 / 0.25
M = 2.8 mol/L⁻¹
hope this helps!
