Question

please answer fast urgent

Answer 1

Hey there,   
Let's say the cars are moving along X axis.

Velocity of car A is $v_a = 80 km/h$

Velocity of car B is $v_b = 50 km/h$
1) Relative velocity of A w.r.t B is given as  $v_a - v_b = 80 - 50 = 30 km/hr$ along positive X axis.

2) Relative velocity of B w.r.t A is given as $v_b - v_a = 50 - 80 = -30 km/hr$

The negative sign indicates direction of this is along negative X axis.

Hope it helps   
Purva  
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