Question
At a soccer practice, the players run sprints. They start at the goal,run 10 m toward the center of the field and then run back to the goal. Then they run 20 m toward the center of the field and back to the goal.Finally they run 30 m toward the center of the field, turn around, and run back to the goal again. One player times herself to try and beat her personal best time . She runs the first 10 min 2.5 s and gets back to the goal in 2.8 s. Then she runs the 20-m sprint in 5.7 s and gets back to the goal in 6.7 s. She runs the final 30-m sprint in 12 s and gets back to the goal in 15 s. What was her average speed for the entire exercise? 2.7m/s 0m/s 2.5m/s 3.0m/s
Answer
4.4
(203 Votes)
Keegan
Professional · Tutor for 6 years
Answer
Explanation
## Step 1: To find the average speed, we need to divide the total distance by the total time taken.## Step 2: Calculate the total distance run by the player.### For the first sprint:
### For the second sprint:
### For the third sprint:
### Total distance:
## Step 3: Calculate the total time taken by the player.### For the first sprint:
### For the second sprint:
### For the third sprint:
### Total time:
## Step 4: The average speed is given by:###
## Step 5: Plugging in the values we have:###
## Step 6: From the options provided, the closest value to
is option
.