A train covers half of its journey with a speed of 30m/per second and

1.	A train covers half of its journey with a speed of 30m/per second and other half of journey with speed of 40m/ per second . Calculate average speed for entire journey
Answer» GIVEN : ▪ A train covers first half of the TOTAL distance at a speed of 30m/s and SECOND half of the total distance at a speed of 40m/s. To Find : ▪ Average speed of train fot entire journey. Concept : ☞ Average speed is defined as the ratio of total distance travelled to the total time taken. ☞ It is a scalar quantity. ☞ It has only magnitude. ☞ SI unit : m/s ✴ When particle covers first half of the total distance at a speed of V1 and final half of the total distance at a speed of V2, then average speed of particle is given by ❍ Vav = 2V1V2/(V1+V2) CALCULATION : → Vav = 2V1V2/(V1+V2) → Vav = 2×30×40/(30+40) → Vav = 2400/70 → Vav = 34.28m/s

A train covers half of its journey with a speed of 30m/per second and other half of journey with speed of 40m/ per second . Calculate average speed for entire journey

Answer»

GIVEN :

▪ A train covers first half of the TOTAL distance at a speed of 30m/s and SECOND half of the total distance at a speed of 40m/s.

To Find :

▪ Average speed of train fot entire journey.

Concept :

☞ Average speed is defined as the ratio of total distance travelled to the total time taken.

☞ It is a scalar quantity.

☞ It has only magnitude.

☞ SI unit : m/s

✴ When particle covers first half of the total distance at a speed of V1 and final half of the total distance at a speed of V2, then average speed of particle is given by

❍ Vav = 2V1V2/(V1+V2)

CALCULATION :

→ Vav = 2V1V2/(V1+V2)

→ Vav = 2×30×40/(30+40)

→ Vav = 2400/70

→ Vav = 34.28m/s

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