I throw a ball with a mass of 2 kg to a height of 20 m. a. What is the potential energy of the ball at this maximum height?
b. What is the amount of kinetic energy I gave to the ball when I threw it into the air?
c. What is the initial speed of the ball?​

Three archers each fire four arrows at a target. joe’s four arrows hit at points 10 cm above, 10 cm below, 10 cm to the left, and 10 cm to the right of the center of the target. all four of moe’s arrows hit within 1 cm of a point 20 cm from the center, and flo’s four arrows hit within 1 cm of the center. the contest judge says that one of the archers is precise but not accurate, another archer is accurate but not precise, and the third archer is both accurate and precise. which description applies to which archer? explain

What is the most useful equation for electric power?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?