p05 019

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19. In terms of magnitudes, Newton’s second law is F = ma, where F represents

| F

net

|, a represents |a|

(which it does not always do; note the use of a in the previous solution), and m is the (always positive)
mass. The magnitude of the acceleration can be found using constant acceleration kinematics (Table 2-
1). Solving v = v

0

+ at for the case where it starts from rest, we have a = v/t (which we interpret

in terms of magnitudes, making specification of coordinate directions unnecessary). The velocity is
v = (1600 km/h)(1000 m/km)/(3600 s/h) = 444 m/s, so

F = (500 kg)

444 m/s

1.8 s

= 1.2

× 10

5

N .


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