Question

A particle moving in a straight line covers half of the distance with a speed of 3m/s.The other half is covered into equal time intervals with a speed of 4.5m/s and 7.5m/s respectively. The average speed of the particle during its motion is

Answer 1

Ans. Avarage speed= 4.5 mtrs/sec

Answer 2

Answer:

4 m/s

Explanation:

let the distance of the first half = s/2

and the distance of the second half = s/2

the time of the first half = s/6

the time of the second half = s/2 ÷ (7.5 + 4.5)/2 = s/12

total time = s/6 + s/12 = s/4

average speed = total distance ÷ total time

Vav = s ÷ s/4 = 4 m/s