Pls help me experts

Dear Student,

We can find the velocity from acceleration time graph by finding area between curve and time axis.

So, from 2 s to 4 s
 

area under a-t graph = area of the square region = length x breadth

or

velocity from 2s to 4s = v₁ = 2s x (-4)m/s²
v₁ = - 8 m/s

Now as 3 s lies in this region, the velocity at 3 sec is also - 8 m/s ( -ve shows retardation in velocity).

Therefore, option '4' is correct.





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