Question

Two cars a and b are running at velocities of 60km/h and 45km/h respectively, with a ahead of



b. calculate the relative velocity of car a if: i) they are both travelling eastwards and ii) car a is travelling eastwards and car b is travelling westwards. what would be the effect on the magnitude of relative velocity if b is ahead of a?

Answer 1

Given that ....

Velocity of car a=Va =60kmph
Velocity of car b =Vb=45kmph

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Velocity of car a relative to b
=Vab = Va - Vb.

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i) when both cars are moving in same direction..

Vab= 60 - 45
Vab = 15kmph

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ii) when both the cars are moving in opposite
direction,,,,,,

Let velocity in east direction is positive.

so Va=60kmph
and Vb=45kmph

So Vab = Va - Vb
= 60 -(-45)
= 105kmph