Which of the following objects has the most kinetic energy?

a car going 60 miles per hour
a spring that is compressed
a rock sitting on the edge of a cliff
a bicycle going 10 miles per hour

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)