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NEET 1989 (AIPMT) · Motion in a Plane (2-D Kinematics)

Motion in a Plane (2-D Kinematics) question from NEET 1989 (AIPMT)

Q28NEET 1989 · AIPMTMedium

Motion in a Plane (2-D Kinematics)

A bus is moving on a straight road towards north with a uniform speed of 50 km/hour then it turns left through $90^\circ$ . If the speed remains unchanged after turning, the increase in the velocity of bus in the turning process is

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Answer: (a)

$\Delta\vec v = \vec v_{west} - \vec v_{north} = 50\,\hat W + 50\,\hat S$
$|\Delta\vec v| = 50\sqrt2 \approx 70.7$ km/h, directed south-west
So the answer is (a) 70.7 km/hr along south-west.

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