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can u explain your ans

P is moving towards Q

multiply and divide by x u will get (1-1)/x which is 0

what i meant was Q is moving along the horizontal
to be precise suppose Q is a point (0,D) then P is (0,0)
Q is moving parallel to x-axis with a constant velocity and P is moving with a velocity v but the direction is towards Q

the velocity of Q is always constant
but the velocity of P is no as it is always changing direction

no
charges have mass and hence they cannot be destroyed
when a positive charge is attracted 2 a negative one the force the potential energy is converted to k energy wich is converted to mass and then the overall system becomes a neutron

initially the velocity is perpendicular to u

2 particles are initially located at points P & Q a distance D apart.They start moving at time t =0 such that the velocity u of Q is always along the horizontal

direction and the vlocity v of P is continually aimed at Q find time taken for the 2 particles to meet