Two particles are fixed on an x axis. particle 1 of charge 40

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Two particles are fixed on an x axis. Particle 1 of charge 40 microC is located at x=-2.0 cm; particle 2 of charge Q is located at x = 3.0 cm. Particle 3 of charge magnitude 20 microC is released from rest on the y axis at y = 2.0 cm.What is the value of Q if the initial acceleration of particle 3 is in the positive direction of (a) the x axis and (b) the y axis?
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How do we know q1 and q3 are positive charge and q2 is negative charge?

kyawswarhein
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why we are using sin function.Why not cos

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