Question

a runner in a relay race covered 100 meters in 20 seconds on a flat track. after taking the baton again, the runner ran another 100 meters uphill in 30 seconds.
what is the runners average speed for the entire relay race if they covered 100 meters on a flat track in 20 seconds and then 100 meters uphill in 30 seconds?
a. 4 m/s
b. 5 m/s
c. 6 m/s
d. 7 m/s

Explanation:

Step1: Calculate total distance

The runner ran \(100 + 100=200\) meters.

Step2: Calculate total time

The runner took \(20 + 30 = 50\) seconds.

Step3: Calculate average speed

Average speed formula is \(v=\frac{s}{t}\), where \(s\) is distance and \(t\) is time. Substitute \(s = 200\) meters and \(t=50\) seconds into the formula: \(v=\frac{200}{50}=4\) m/s.

Answer:

A. 4 m/s