A student starts a stop-watch when the bob reaches to point M. He counts each time the bob changes direction and stop the watch on the tenth change in direction. The watch shows a time of 12.0 seconds. calculate the time period

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.