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**Homework Statement**

The question is:

The velocity of a particle is given as a function of its position s:

v = (A - 4 s

^{2})

^{1/2}

where s is displacement (in m), and v is velocity (in m/s). A is a constant but you do not need to know its value to answer this question.

What is the acceleration (in m/s

^{2}) when s is as given below?

S=1.9m

**The attempt at a solution**

i have tried integrating using the fact that v=ds/dt

this gets 1/((A - 4 s

^{2})

^{1/2})ds=dt.

I integrated first by using partial fractions then using the fact that 1/(A

^{2}-x

^{2})

^{1/2}=arcsin(x/a)

However whatever i do i end up with the constant A still in there??