A) 0
B) 50 m/s
C) 48 m/s
D) 52 m/s
Correct Answer: C
Solution :
Let the total distance be 100 m. Then time taken to complete half (50m) at \[60m/s=\frac{50}{60}s\] time taken to complete half \[(50m)\]at \[40m/s=\frac{50}{40}s\] Total time taken\[=\left( \frac{50}{60}+\frac{50}{40} \right)s=\frac{25}{12}s\] Average speed\[=\frac{100}{\frac{25}{12}}\] Or \[\frac{100}{25}\times 12=48m/s\]You need to login to perform this action.
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