20. The air resistance, R Newtons, to the motion of a train varies as the square of its speed (meters/sec). If the
resistance is 2,400 Newtons when the speed is 10 m/sec, what is the value of R when the speed is 20 m/sec?
A. 96
B. 960
C. 9 600
D. 96 000
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i think option d is very corrected answer ok dearr
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Answer:
1 a C b 10 seconds. 2 a B b steepest line. 3 a 200 m b speed = 200 m / 50 s = 4 m/s. 4 D, this is the slowest part ... 600 m/s2. 5 1 mg = 0.001 g = 0.000001 kg, force. = 0.000001 kg × 1200 m/s2 = 0.0012 N. 6 a force = 1200 ...
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