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AURORKA [14]
2 years ago
9

a driver shifts into neutral when her 1200 kg is moving at 80 km/h and finds the speed has dropped to 65 km/h 10 s later . what

was the average drag force acting on the car? ...?
Physics
1 answer:
Liono4ka [1.6K]2 years ago
6 0
Drag<span> is a </span>force<span> acting opposite to the relative motion of any object moving. It can be calculated as follows:

</span><span><span>vi </span>= (<span><span>80km/</span><span>hr) (1</span></span><span><span>hr / </span><span>3600sec) (</span></span><span><span>1000m/</span><span>1km) </span></span>= <span><span>22.2 m/</span>sec

</span></span> <span><span>vf</span>= (<span><span>65km/</span><span>1hr) (</span></span><span><span>1hr/</span><span>3600sec) (</span></span><span><span>1000m/</span><span>1km) </span></span>= <span><span>18.06 m / </span>sec</span></span> <span>
a=<span><span><span>vf</span>−<span>vi / </span></span><span><span>tf</span>−<span>ti = </span></span></span><span><span>18.06m/s−22.2m/s / </span><span>10sec−0sec</span></span>= <span><span>−0.414m</span><span>sec2

</span></span></span><span>F = ma = 1200kg×<span><span>−0.414m</span><span>s2 </span></span>= −496.8N</span>
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