The following are four different relations about displacement, velocity, and acceleration for the motion of a particle in general. Choose the incorrect statement(s):
(a) vav = 1/2 [v(t1) + v(t2)]
(b) vav = r(t2)-r(t1)/t2-t1
(c) r = 1/2 [v(t2)-v(t1)](t2-t1)
(d) aav = v(t2)-v(t1)/t2-t1
1. (a), d)
2. (a), c)
3. (b), c)
4. (a), b)
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