18-2.A particle covers eachof the total distance with speed V1, V2 and

1.	18-2.A particle covers eachof the total distance with speed V1, V2 and v3 respectively. Find the averagespeed of the particle ?
Answer» let The Total distance = S Time to cover the first 1/3 of S = t1 = (S/3) / v1 = S/(3 v1) Time to cover the second 1/3 of S = t2 = (S/3)/v2 = S/(3 v2) Time to cover the last 1/3 of S = t3 = (S/3 ) / v3 = S/ (3v3) ER. RAVI KUMAR ROY. Total time = t = S/3 [ 1/v1 + 1/v2 + 1/v3 ] Let v = average speed v = S / t So 1/v = t / S 1/ v = 1/3 [ 1/v1 + 1/v2 + 1/v3 ]

18-2.A particle covers eachof the total distance with speed V1, V2 and v3 respectively. Find the averagespeed of the particle ?

Answer»

let The Total distance = S

Time to cover the first 1/3 of S = t1 = (S/3) / v1 = S/(3 v1)

Time to cover the second 1/3 of S = t2 = (S/3)/v2 = S/(3 v2)

Time to cover the last 1/3 of S = t3 = (S/3 ) / v3 = S/ (3v3)

ER. RAVI KUMAR ROY.

Total time = t = S/3 [ 1/v1 + 1/v2 + 1/v3 ]

Let v = average speed

v = S / t

So 1/v = t / S

1/ v = 1/3 [ 1/v1 + 1/v2 + 1/v3 ]