At the annual turtle races, Poindexter, the previous year's winner, is trying to retain his title. As the race begins Poindexter starts off moving with a speed of 0.025 m/s. He retains this speed for 0.5 meters at which time he speeds up to 0.10 m/s. He continues at this rate for 0.75 meters. Tiring, he slows to 0.07 m/s and continues for another half of a meter. Applying all his concentration and effort for the last bit of the race he increases his speed to a swift 0.085 m/s. An exhausted Wood Turtle, Poindexter completes his two meter race beating his closest competitor by a nose.
In what amount time did Poindexter run the race?
2007-01-11 06:09:03 · 2 answers · asked by star wars freak 2 in Science & Mathematics ➔ Physics
I'm not doing your homework for you but here:
.5 meters at .025 m/s so divide .5 by .025, thats 20 seconds
another .75 at .1 m/s sec, divide and add the result to 20 seconds, keep adding them up for the total time.
Break it up into each distance/speed segment, do the math then add up all the seconds. Your numbers are all in m/s so you don't need to convert anything. You'll get the last segment distance by subtracting how far he has allready gone from 2m.
: )
2007-01-11 06:22:39 · answer #1 · answered by Tim H 3 · 0⤊ 0⤋
speed=distance/time
time=distance/speed
time=0.5/0.025 + 0.75/0.1 + 0.5/0.07 + 0.25/0.085
=20+7.5+7.14+2.94
=37.58s
2007-01-11 14:23:46 · answer #2 · answered by adriantheace 4 · 0⤊ 0⤋