two cars are moving in a straight line in same direction with same speed of 70km/h . The relative velocity of one car with respect to other is
1- 70km/h
2-140km/h
3-35km/h
4-zero
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Option 4, Zero
Relative velocity
It is the velocity of one body with respect to the other. We use sign convention to find out Relative velocity. We need to subtract the velocities after applying sign convention.
The body relative to which we need to find relative velocity must be taken as positive.
In the given question, Let say Two cars A & B are moving.
Consider direction of car A as positive,
Relative velocity of Cars with respect to the other,
Rel. V = 70 - 70 = 0 m/s.
Since both body are in same direction and also, Same velocities. They seem to be in rest with respect to each other.
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