Question

A body moving along straight line covers a distance in three equal parts with speed 2m/s, 3 m/s, 4m/s, then its avg speed will be

Answer 1

Answer:

Please refer the below attachment !

Answer 2

Answer:

avg speed = 36/13 m/s

Explanation:

let total distance = 3x

so,

t1 = x / 2

t2 = x / 3

t3 = x / 4

total time taken = x (1/2 + 1/3 + 1/4)

= x ( 6 + 4 + 3 )/ 12 = 13x/12

average speed = total distance / total time

= 3x / (13x/12) = 3x × 12 / 13x = 36/13 m/s