Q.

A lift start from rest. Its acceleration is plotted against times in the following graph. When it comes to rest, its height above its starting point is 
 

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a

32m

b

20m

c

128m

d

64m

answer is D.

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S=12a1t12+Vt2+(Vt312a2t32)

V=at1

 

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A lift start from rest. Its acceleration is plotted against times in the following graph. When it comes to rest, its height above its starting point is