A particle starting from rest has a constant acceleration of 4 m/s2 for 4 seconds. It then retards uniformly for next 8 seconds and comes to rest. Average acceleration during the motion of the particle is
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a
4 m/s2
b
zero
c
8 m/s2
d
-4 m/s2
answer is B.
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Detailed Solution
Average acceleration is zero, because change in velocity is zero.