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Two cars moving in the same direction have speeds of 100 kmh-1 and 130 kmh-1 wha...


Question

Two cars moving in the same direction have speeds of 100 kmh-1 and 130 kmh-1 what is the velocity of the faster car as measured by an observer in the slower car?

Options

A) 30 kmh-1

B) 130 kmh-1

C) 200 kmh

D) 230 kmh-1


The correct answer is A.

Explanation:

Since the cars are moving in the same direction, the velocity of a body A, Va,relative to another body B, Vb is given by V = Va - Vb
∴ the velocity of faster car is measured by the observer in the slower car is V = 130kmh-1 - 100 kmh-1 = 30 kmh-1

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Dicussion (1)

  • Since the cars are moving in the same direction, the velocity of a body A, Va,relative to another body B, Vb is given by V = Va - Vb
    ∴ the velocity of faster car is measured by the observer in the slower car is V = 130kmh-1 - 100 kmh-1 = 30 kmh-1