Questions

A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 seconds for every circular lap. The average velocity and average speed for each circular lap respectively is

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a

10 m/s, 0

b

0, 0

c

0, 10 m/s

d

10 m/s, 10 m/s.

detailed solution

Correct option is C

Distance travelled in one rotation (lap) =2πr∴Average speed=distancetime=2πrt=2×3.14×10062.8=10 m s-1Net displacement in one lap=0Average velocity=net displacement time=0t=0

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A particle moves along a horizontal circle with constant speed. If 'a' is its acceleration and 'E' is its kinetic energy

A) a is constant B) E is constant C) a is variable D) E is variable

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