Helen is driving her car if the kinetic energy of the car is 8.10 E4 J and the mass of the car and its contents is 1010 kg Helen
is driving at a speed of
1.26 m/s
9.01 m/s
12.0m/s
12.6m/s
81.1m/s
1 answer:
( 8.10) x 10^4 J = ½(1010kg)V²
<span>......................= 505V² </span>
<span>( 8.10) x 10^4 J =[(.0505) x 10^4] V² ........<==10^4 cancels </span>
<span>8.10 = .0505 V² </span>
<span>.........______ </span>
<span>V = ²√ 160.4 </span>
<span>V= 12.6 m/s </span>
<span>(that's 12.6m/sec(1km/1000m)(3600secs/1hr) = 45.36kph) </span>
<span> my diagram is wrong, it is just an ordinary car, </span>
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