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disa [49]
3 years ago
10

What average force is required to stop a 980 kg car in 9.0 s if the car is traveling at 91 km/h ?

Physics
1 answer:
kozerog [31]3 years ago
5 0
Newton's second law of motion:
F=ma
a =  \frac{v}{t}
You convert from km/h to m/s by dividing by 3.6:
v = 91 \div 3.6
v = 25.3 \:  \frac{m}{s}
Then a is:
a =  \frac{25.3}{9}
a = 2.8  \frac{m}{s {}^{2} }
Then:
F=(980)(2.8)=2744 N
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