An advertisement claims that a particular automobile can "stop on a dime".
What net force would actually be necessary to stop an automobile of mass 850 kg traveling initially at a speed of 40.0 km/h in a distance equal to the diameter of a dime, which is 1.8 cm
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One Response
6.6.2009
Convertt velocity into SI units 40.0km/h = 11.11m/s
Calculate the acceleration of the car in stopping
V² = u² + 2 a*s
0 = 11.11² + 2 a* 0.018
a = 123.5 /-0.036
a = – 3429.4m/s² (-ve sign confirms slowing down
F(net) = m*a
F(net) = 850*-3429.4
F(net) = – 2 914 951.7N The negative sign indicates that the force is in opposite direction to the direction of the car, which is what we would expect
Answer 2 914 951.7N. in opposite direction to direction of car.