what is the net work performed?

M

Mr. X

New member
A 16 kg brick moves along an x axis. Its acceleration as a function of its position is shown in Fig. 7-37. What is the net work performed on the brick by the force causing the acceleration as the brick moves from x = 0 to x = 6.7 m?

http://edugen.wiley.com/edugen/courses/crs4957/art/qb/qu/c07/fig07_37.gif


I did:

W=FD
W=m*a*d
a=20/8=2.5m/s^2
d=6.9m
m=16kg

w=16*2.5*6.9 J

but that's not it.
 
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