Find the density of a object in #2 if it has a mass of 20 g

What is the magnitude of the resultant vector round your answer to the nearest tenth

2. -/1 pointsserpse10 2.7.p.017.mi. an object moving with uniform acceleration has a velocity of 14.0 cm/s in the positive x direction when its x coordinate is 2.97 cm. if its x coordinate 2.85 s later is -5.00 cm, what is its acceleration? cm/s2 need ? read it master it

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?