Two train 120m and 80m in length are running in opposite direction wit

1.	Two train 120m and 80m in length are running in opposite direction with velocities 42 km/hr and 30km/hr. In what time they will completely cross each other
Answer» Answer Total displacement , d = 120 m + 80 m ⇒ d = 200 m Relative VELOCITY , v = 42 km/h + 30 km/h ⇒ v = 72 km/h = 20 m/s Time , t = ? s We know that Speed is defined as velocity per time $:\to \bf Velocity=\dfrac{Displacement}{Time}\\\\:\to \rm 20=\dfrac{200}{t}\\\\:\to \rm t=\dfrac{200}{20}\\\\:\to \rm t=10\ s$ So , Time = 10 s

Two train 120m and 80m in length are running in opposite direction with velocities 42 km/hr and 30km/hr. In what time they will completely cross each other

Answer»

Answer

Total displacement , d = 120 m + 80 m

⇒ d = 200 m

Relative VELOCITY , v = 42 km/h + 30 km/h

⇒ v = 72 km/h = 20 m/s

Time , t = ? s

We know that Speed is defined as velocity per time

$:\to \bf Velocity=\dfrac{Displacement}{Time}\\\\:\to \rm 20=\dfrac{200}{t}\\\\:\to \rm t=\dfrac{200}{20}\\\\:\to \rm t=10\ s$

So , Time = 10 s

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Two train 120m and 80m in length are running in opposite direction with velocities 42 km/hr and 30km/hr. In what time they will completely cross each other ​

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Two train 120m and 80m in length are running in opposite direction with velocities 42 km/hr and 30km/hr. In what time they will completely cross each other