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5.OutofthetwocarsAandB,carAismovingtowarueast with a velocity of 10 m/s whereas B is movingtowards north with a velocity 20 m/s, then velocity ofA w.r.t. B is (nearly)(1) 30 m/s(3) 22 m/s(2) 10 m/s(4) 42 m/s

Answer»

Let`s say east be positive X direction. And north be +Y direction. Now VA=10iVB= 20j

Now VAB =Va-Vb= 10i-20j so the sqrt(500) = 10sqrt522.36 m/s

Given that

VA =10 m/s i

VB = 20 m/s j

Vab = Va - Vb = 10i - 20j

Vab = √(10)^2 + (-20)^2 = √500

Vab = 10√5 = 22.30 m/s is the answer



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