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WAEC Physics 2010 Paper

Question : 7

Total: 50

Solution:

Concept:

When two bodies move in opposite directions, the relative velocity of one with respect to the other is the sum of their velocities.

Explanation:

Car X is moving at

110\ \text{kmh}^{-1}

Car Y is moving at

90\ \text{kmh}^{-1}

in the opposite direction.

Since they travel in opposite directions, their velocities add up for relative motion.

Velocity of X relative to Y is:

v_{XY} = 110 + 90 = 200\ \text{kmh}^{-1}

Answer:

200\ \text{kmh}^{-1}

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