# Three particles A,B and C each of mass m are lying at the corners of an equilateral triangle of side L. If the particle A is released keeping the particles B and C fixed, the magnitude of instantaneous acceleration of A is ......?

Gravitational force acting on the particle A due to the particle B:

Gravitational force acting on the particle A due to the particle C:

Magnitudes of  are equal to each other.

Let ${F}_{1}={F}_{2}=F$

Angle between

Net force acting on the particle A:

Acceleration of the particle A:

• 137
...b
• -27
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