Question

(WRITE NEAT) NO CURSIVE...

During the U.S. trials for the 2004 Summer Olympics, Michael Phelps broke his own world record in the 400 meter individual medley when he was clocked at 4:08:41. What was his average velocity and his average speed? Give your answer in SI units, in mph, and in kilometers per hours.

(, you will need to convert the 4 minutes to seconds. How many seconds are in a minute? Then you add it to the seconds in the time. Once all of the time is in seconds you can solve for velocity because you have distance)

Answer 1

We have distance d=400 meters

time = 4 minute 08 second and 41/100 second

total time second is =4$\times$60+8+41/100

=248.41 s

Now Average speed s= total distance/ total time

=400/(248.41)

S =1.61 m/s ANS

In mile per hour S =1.61$\times$2.24=3.61 mph ANS

In kilometer per hour S=1.61$\times$3.6=5.80 KPH ANS

Here distance and displacement is same so the average velocity is same as average speed.