Four charges are placed at the four corners of a square of side 15 cm. the charges on the upper left and right corners are +3 μc and -6 μc respectively. the charges on the lower left and right corners are -2.4 μc and -9 μc respectively. the net electric force on -9 μc charge is: a. 18 n, 750 below the positive x-axisb. 18 n, 750 below the negative x- axisc. 18 n, 750 above the negative x- axisd. 18 n, 750 above the positive x- axis

the velocity you are looking for is made up of two parts: horizontally velocity, vh, and its vertical velocity, vv. the actual velocity of the ball will be these two parts added together, and because velocity is a vector then they will need to be added vectorially.  

neglecting air resistance etc etc.,  

the horizontal velocity component will be constant (because there is no accelerating force in the horizontal direction.  

vh = 8 ms-1  

the vertical velocity component has an accelerating force: 'g'.  

using v = u +at where a = g = 9.81 ms-2.  

the vertical component of velocity, vv = 0 + gt = vv =9.81 x 2  

vv = 19.62 ms-1 . the zero appears because the virtical component of velocity at time t=0 is zero. remember, the ball was thrown horizontally.  

how fast it will be moving (it actual path (being a parabola )) will be the vector sum of these two.  

adding vectorally gives: -  

v = sqr root (8^2 + 19.62^2) = sqr root(64+384.9) = 21.18 or 21.2 ms-1

increases it

i think the answer is tomato juice? not entirely sure though