A particle moving in a straight line covers half the distance with speed 3 ms -1 . The other half is covered in two equal time intervals with speeds 4.5 ms -1 and 7.5 ms -1 , respectively. The average speed of the particle during motion is
Text Solution
Verified by ExpertsThe correct answer is:
D
Here t 1 = 
; x 1 = 4.5 t 2
Also x/2 = 7.5 t 2 = x 1 + x 2 = 12t 2
or t 2 = x/24
t = 
v = 
= 4.8 ms -1
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