A car moves from X to Y with a uniform velocity v u and returns to X with a uniform velocity v d . The average speed for this round trip is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Average speed of a body in a given time interval is defined as the ratio of distance travelled to the time taken.
Average speed = 
Let t1 and t2 be times taken by the car to go from X to Y and then from Y to X respectively.
Then , t 1 + t 2 = 
+ 
= XY 
Total distance travelled
= XY + XY = 2XY
Therefore, average speed of the car for this round trip is
ν av = 
or ; ν av = 
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