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A particle starts from rest and moves in a straight lin...

A particle starts from rest and moves in a straight line such that its velocity, V ms1, at time t second is given by V = 3t2 - 6t. Calculate the acceleration in the 3rd second. 

A.

12m

B.

16m

C.

64m

D.

96m

Correct answer is B

V = 3t2 - 6t

dsdt=3t26t

s = 3t26t

s = 3t336t22+k

s = t3 - 3t2 + k

s = 0, t = 0

s = t3 - 3t2 

s = 43 - 3t2 

s = 43 - 3(4)2 

= 64 - 48 = 16m