14. An automobile traveling on a straight, level road at 14 m/s speeds up to 25 m/s in 30 seconds. What was the magnitude of the auto's acceleration?
15. Two opposite forces of 6.0 N and 4.0 N act on a 2.0 kg object. What is its acceleration?
16. An automobile with a mass of 100 kg is moving north on a level highway with a constant velocity of 80 km/h. What is the net force acting on the automobile?© BrainMass Inc. brainmass.com July 20, 2018, 6:39 pm ad1c9bdddf
14. An automobile traveling on a straight, level road at 14 m/s speeds up to 25 m/s in 30 seconds. What was the magnitude of the automobiles acceleration?
Acceleration (a) is rate of change of velocity, thus we can express this as
a = change in velocity/change in time = Delta(v)/Delta(t)
Change in velocity is Delta(v) = final velocity - initial velocity = 25 - 14 = 11 m/s
Change in time Delta(t) = 30 - 0 = 30 s
a = 11/30 = 0.367 ...
Change of velocity is examined over a known time to derive the acceleration of that body, Newtons second Law is used to detemine the net acceleration of a body of known mass when two opposing unequal forces are applied to that body and the net force acting on a body moving at constant veloicty is shown to be zero