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? ... ?

Question

Kaeden Pitts

Physics

31 October, 13:27

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? ... ?

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Jeremy Hopkins · Answer 1

Drag is a force acting opposite to the relative motion of any object moving. It can be calculated as follows:

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

vf = (65km / 1hr) (1hr / 3600sec) (1000m / 1km) = 18.06 m / sec

a = vf - vi / tf - ti = 18.06m/s-22.2m/s / 10sec-0sec = - 0.414m sec2

F = ma = 1200kg * - 0.414m s2 = - 496.8N