Day 578: JEE Mains Physics

1. A.
   at $x > x_{4}$, K.E. is constant throughout the region.
2. B.
   at $x < x_{1}$, K.E. is smallest and the particle is moving at the slowest speed.
3. C.
   at $x = x_{2}$, K.E. is greatest and the particle is moving at the fastest speed.
4. D.
   at $x = x_{3}$, K.E. $= 4\text{ }J$.

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1. A.
   $31.25 \times 10^{17}$
2. B.
   $6.25 \times 10^{18}$
3. C.
   $6.25 \times 10^{17}$
4. D.
   $1.25 \times 10^{19}$

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1. A.
   To conduct excess charge due to air friction to ground and prevent sparking.
2. B.
   To alert other vehicles
3. C.
   To protect tyres from catching dirt from ground.
4. D.
   It is a custom.

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1. A.
   $4a_{1} + 2a_{2} + a_{3} + a_{4} = 0$
2. B.
   $\ a_{1} + 4a_{2} + 3a_{3} + a_{4} = 0$
3. C.
   $a_{1} + 4a_{2} + 3a_{3} + 2a_{4} = 0$
4. D.
   $2a_{1} + 2a_{2} + 3a_{3} + a_{4} = 0$

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