Intersection 81457

Two cars started from the right-angled intersection of two roads. The first at a speed of 80 km/h and the second at a speed of 60 km/h. How fast are they moving away from each other?

Correct answer:

v =  100 km/h

Step-by-step explanation:

v1=80 km/h v2=60 km/h  s=s12+s22  (v t)2=(v1 t)2+(v2 t)2  v2 = v12+v22  v=v12+v22=802+602=100 km/h

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