First, find the magnitude of v , that is, the speed v of the two-car unit after the collision.?
in this problem we will consider the collision of two cars initially moving at right angles. we assume that after the collision the cars stick together and travel off as a single unit. the collision is therefore completely inelastic.

two cars of masses m1 and m2 collide at an intersection. before the collision, car 1 was traveling eastward at a speed of v1, and car 2 was traveling northward at a speed of v2. (figure 1) after the collision, the two cars stick together and travel off in the direction shown.

first, find the magnitude of v , that is, the speed v of the two-car unit after the collision.

express v in terms of m1, m2, and the cars' initial speeds v1 and v2.
i got an answer to be v=sqrooot( (m1*v1)/(m1+m2))^2+((m2*v2)/(m1+m2) )^2
is this wrong ? ?

If an object is moving or in motion

Acetic acid  /əˈsiːtɪk/, systematically named  ethanoic acid  /ˌɛθəˈnoʊɪk/, is a colourless liquid  organic compound  with the  chemical formula  ch3cooh (also written as ch3co2h or c2h4o2). when undiluted, it is sometimes called  glacial acetic acid.  vinegar  is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water. acetic acid has a distinctive sour taste and pungent smell. in addition to household vinegar, it is mainly produced as a precursor to  polyvinyl acetate  and  cellulose acetate. it is classified as a  weak acid  since it only partially  dissociates  in solution, but concentrated acetic acid is corrosive and can attack the skin.acetic acidnamespreferred iupac nameacetic acidsystematic iupac nameethanoic acidother namesvinegar (when dilute); hydrogen acetate; methanecarboxylic acid[1][2]identifierscas number64-19-7  3d model (jsmol)interactive image3dmetb00009 reference506007chebichebi: 15366  chemblchembl539  chemspider171  drugbankdb03166  echa infocard100.000.528ec number200-580-7e numbere260  (preservatives)gmelin reference1380iuphar/bps1058keggd00010  meshacetic+acidpubchem  cid176rtecs numberaf1225000uniiq40q9n063p  un number2789inchiinchi=1s/c2h4o2/c1-2(3)4/h1h3,(h,3,4)  key:   qtbsbxvteameqo-uhfffaoysa-n  smilescc(o)=o