If mechanical energy is conserved, then a pendulum that has a potential energy of 20 j at its highest point and 0.5 j at its lowest point has as its kinetic energy at its lowest point.

20 j
0.5 j
19.5 j
20.5 j

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v