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21 November, 11:16

A glider moving with a speed of 200 kilometers/hour experiences a cross wind of 30 kilometers/hour. What is the resultant speed of the glider relative to the ground?

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  1. 21 November, 11:37
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    You didn't say so, but we must assume that the "200 km/hr" is

    the glider's air-speed, that is, speed relative to the air.

    If the air itself is moving at 30 km/hr relative to the ground and

    across the glider's direction, then the glider's speed relative to

    the ground is

    √ (200² + 30²)

    = √ (40,000 + 900)

    = √ (40,900) = 202.24 ... km/hr (rounded)
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