A rock is thrown from a height of 10 m. It is initially thrown at an angle of 65° below the horizontal. If it takes 0.8 s to hit the ground, what was the rock’s initial speed? Air resistance can be neglected. A 20.3 m/s B 8.58 m/s C 7.33 m/s D 18.1 m/s E 9.47 m/s

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples