Put values in above formula and get the result 1000 meter

लोग जन्म लेते हैं और तरह तरह के रास्ते अपनाते हैं सुख-दुख, आराम - तकलीफ से होते हुए आगे बढ़ते हैं, उनमें से कुछ लोग रास्ता चुनते हैं लोगों को जागरूक करने का, ऐसे लोगों के जीवन में भी आते हैं, सुख-दुख, आराम - तकलीफ लेकिन वो आगे बढ़ते रहते हैं क्योंकि ये एक बहुत जरूरी काम है, हर युग में जरूरी |

ताकि समाज में समता आये, लोगों को गरिमामय जीवन मिले और वो अपने अधिकार को लेकर जागरूक और सचेत रहने के साथ दूसरों की तकलीफों और जरूरतों को लेकर संवेदनशील रहें  और इस तरह निर्माण हो सके एक खूबसूरत और शुकून भरे समाज का |

- लवकुश कुमार 

To approach a question either write the formula of desired quantity and then put the values directly or indirectly from given values in question

                                                                                                                          or

 write the main equation of that *topic* so that you can know which quantities can be deduced from the *given* values and *main equation* 

For example in questions of photo electric effect you can always *start* the question by writing *main equation* and then putting given values and checking what you can find by putting those values.   K.E  = E - W ;

energy, E can be replaced by expression in terms of freuency / wavelength

work function, W can be replaced by expression in terms of threshould frequency /  threshould wavelength

Maximum kinetic energy K.E. can be replaced by expression in terms of velocity or stopping potential.

Basic understanding like -

to cross a pole, a train need to travel a distance equal to it's length... Because pole is said to be crossed only when the guard's wagon(last wagon) crosses the pole.

I don't fear the man who practiced 1000 punch. 

I fear the man who practice one punch 1000 *times* - Bruce Lee

Practice each questions 2-3 times until you become used to or comfortable with the analytical process involved in it.

Best Wishes

1. Understand each definition by working out on each word used in it, refer to diagrams and imagine the mechanism discussed.

2. Solve numericals by analysing the examples, more numericals may leads to greater clarity of the concepts.

3. Learn to interconnect two properties like :

Pressure by gas molecules and its dependence over temperature

Pressure is force per unit area normal to force

Force is rate of change of linear momentum

momentum is product of mass and velocity

velocity is related to energy

energy is related to temperature.

Now reverse it 

higher temperature means more energetic gas particles

more energetic gas particles means greater velocity

greater velocity means greater momentum

greater momentum means larger change in momentum

leading to greater force which in turn may lead to higher pressure.

Note- If the piston of a cylinder containing gas is free to move then on heating (or increasing the temperature) the gas, pressure remians constant (as piston get shifted due to increased force by the gas molecules) and volume increases due to faster moving particles/molecules while if piston is fixed then volume is fixed so on increasing temperature the pressure will increase. 

4. Be good at interpreting formula; viz. learn to deduce dependency of various parameters on each other involved in a formula.

For example, in   v = a*t 

means v is directly proportional to a if t is constant in words greater acceleration, means greater speed after a particular time t .

in a = Force / mass

acceleration a is inversely proportional to mass m for a fixed force. In other words for a heavier body the same force will generate lower acceleration.

It is quite easy to check facts if formula is known to you.

for example- 

Whether resistance for a conductor inreases or decreases with increase in temperature ?

one way - increased rate of collisions between free electrons will increase resistance.

Another way-      R2 = R1 (1 + alpha * t )

as alpha is positive for conductors so final resistance R2 will be higher than initial resistance R1 after increasing temperature by t. 

Best Wishes.