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Two trains having lengths 120 m and 100 ...

Two trains having lengths 120 m and 100 m running in the opposite directions with velocities 40 km/h and 50 km/h. In what time they will completely cross each other?

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`"Relative velocity of one train w.r.t. second "=40-(-50)=90km//h=25ms^(-1)`
`"Total distance travelled "=120+100=220m`
`"Time"=("Distance")/("Velocity")=(220)/(25)=8.8s`
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AAKASH INSTITUTE-MOTION IN A STRAIGHT LINE-ASSIGNMENT (SECTION - D)
  1. Two trains having lengths 120 m and 100 m running in the opposite dire...

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  2. A : It is not possible to have constant velocity and variable accelera...

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  3. A : The direction of velocity of an object can be reversed with consta...

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  4. A : When the velocity of an object is zero at an instant, the accelera...

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  5. A : A body moving with decreasing speed may have increasing accelerati...

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  6. A : for a moving particle distance can never be negative or zero. R ...

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  7. A : If speed of a particle is never zero than it may have zero averag ...

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  8. A : The magntidue of average velocity in an interval can never be grea...

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  9. A : The area under acceleration - time graph is equal to velocity of o...

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  10. A : The motion of body projected under the effect of gravity without a...

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  11. A : The relative acceleration of two objects moving under the effect o...

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  12. A : In the presence of air resistance, if the ball is thrown verticall...

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  13. A : The following graph can't exist actually R :Total path length...

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  14. A : The displacement (s) time graph shown in the figure represents an ...

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  15. A : Average velocity can be zero, but average speed of a moving body c...

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  16. A : For a particle moving in a straight line, its acceleration must be...

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