Three identical charges (q= +5.0 mC) are along a circle with a radius of 2.0 m at angles of 30° , 150°, and 270°, as shown in the figure below.
What is the resultant electric field at the center in N/C?

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?