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## Resolved Question

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# Physics question PLEASE is this correct?

1) We have an object which the first part of the ROAD runs with the speed 5 m/s and the second half 8 m/s.Find its average speed.
b) We have an object which the first part of the TIME runs with the speed 5 m/s and the second half 8 m/s.Find its average speed.

IS the answer the same for both questions?(I know how to find average speed)
by Jim
Member since:
September 07, 2009
Total points:
67,047 (Level 7)

## Best Answer - Chosen by Voters

Usually you compute AVG SPEED by its DEFINITION and not use some other way.
The definition of AVG speed = total distance/total time
so
in each case compute: 1) total distance and 2) total time to travel total distance
and
divide 1) by 2) <== ANS

Comment: confusion comes largely from the situation of CONSTANT ACCELERATED motion. In this situation (and ONLY THIS situation) the average speed can be computed by taking the average of the two "end point" speeds.
100% 1 Vote

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