Question
4) A runne r ran a 400 m race in 1 min 35 sec . Calculate his average speed in m/sec S=Ddiv T underline ( )m/sec
Answer
4.2
(255 Votes)
Riley
Expert · Tutor for 3 years
Answer
Step1: Distance (D) is referred as: 400m Step2: The total time (T) is calculated as:
Result:
Step3: Substitute values: S (speed) =
Calculate S equal to approximately
So the average speed of the runner is 4.21 m/sec.
Explanation
## Step1: We should start by taking a look at the given problem in more depth.To calculate the runner's average speed, we need to use the specific formula,
, where S represents speed, D, distance and T, time. Here, the distance (D) is mentioned as 400 m.## Step2: Calculate the total time in seconds.The duration for the runner is given as 1 minute and 35 seconds. It's worth mentioning that 1 minute equals 60 seconds, therefore, to get the total time in seconds, we simply multiply 1 (minute) with 60 (convert minutes to seconds) and add the rest 35 seconds. This gives, (1 min*60 sec/min + 35 sec).## Step3: Calculate the speed by substituting values of distance and time into the formula.Calculate the average speed by plugging in the values of 'distance' and 'total time in seconds 'in the formula. Thus obtain the speed in meters per second.