what is the AVERAGE ACCELERATION of the sprinter and HOW LONG does it take him to reach that speed???
please and thank you for your help!! my friends and i have been trying to figure out this problem, we're wondering if you guys can help us. thnx again!
2006-10-02 05:13:25 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics
In this problem, to find acceleration you would use the formula,
v_f^2 = v_i^2 + 2ad
where v_f and v_i are the final and initial speeds respectively, a is the average acceleration, and d is the distance the object accelerates over.
You know the final speed of 11.5 m/s, the initial speed is 0 m/s, and the distance is 15 m. Just plug in and solve for the acceleration.
2006-10-02 05:27:27 · answer #1 · answered by mrjeffy321 7 · 0⤊ 0⤋
WKT v*v = u*u+2as
11.5*11.5 = 2.a.15
a=132.5/30
a=4.4083333m/s*s
v=u+at
t= 11.5-0/4.408333333
t= 2.608s
2006-10-02 12:26:48 · answer #2 · answered by Anonymous · 0⤊ 0⤋