At the annual turtle races, Poindexter, the record holder, is trying to retain his title. As the race begins, Poindexter starts off racing North 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.
A.In what amount of time did Poindexter run the race? (Show all your work.)
Time= Distance/Speed,
It was a 2 meter race= 0.5/.025=20, .75/.125=6, .5/.055=9.1, .25/0.085=2.9. 20+6+9.1+2.9=38seconds.
B.What was his average speed? (Show all your work.)
Average speed= total distance/ total time.
2/38=0.053m/s^2 Average Speed.
C.What was his displacement?
I have no idea?! Please help!
To calculate the displacement of Poindexter, we need to find the difference between his starting point and ending point. In this case, his starting point is 0 meters, and his ending point is 2 meters (since it was a 2-meter race).
Therefore, the displacement is 2 - 0 = 2 meters.