p05 042

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42. The mass of the jet is m = W/g = 2.36

× 10

4

kg. Its acceleration is found from Eq. 2-16:

v

2

= v

2

0

+ 2ax

=

⇒ a =

85

2

2(90)

= 40 m/s

2

.

Thus, Newton’s second law provides the needed force F from the catapult.

F + F

thrust

= ma

=

⇒ F =



2.36

× 10

4



(40)

107 × 10

3

which yields F = 8.4

× 10

5

N.


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