top oot race . 00in fer Sofety.neascna. Cer sider such eleac sks. in th torhng a
ID: 1877677 • Letter: T
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top oot race . 00in fer Sofety.neascna. Cer sider such eleac sks. in th torhng a race at rest Astr the laght turns qreen the clrngges complekes his prablem Ract . Heu mamy tines largec ls the draqsters accelerahicn clusang this, pesited than the occeleroken clue te qrauby? alg the clrdfter could continue-with-the auerage acceleraten,w culdl ih speed in mles per haue, offe it hes hraieleel a tahal eistonce of I km(mile)? icle's positien alen where tis n ccenels ,y is in mehers ,anel the canstants A and B are abl lwhat is the vclouthy an mehers t bi what is the veloty in mcha pec secendl, of en cace riele a hicycle fer 17.5mles, then ycu must run fur.aouther 76 miles ith what awerage s fer the enhre race o to be lmih?Explanation / Answer
1.
use the kinemtatic equation
S = 0.5 a t^2
where S is the Displacement
a is accleration
t is the time
so
Accleration a = 2S/t^2
a = (2*400)/(9.4)^2
a = 9.053 m/s^2
so a/g = 9.053/9.81 = 0.922
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part B:
use the equation V^2 = 2 a S
where S =1.6 km = 1600 m
v^2 = (2* 9.053 * 1600)
v = sqrt(28969.6)
v = 170.20 m/s
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