Qué diferencia de longitud tiene un péndulo que tiene un período de 1 s en Bogotá y en el Ecuador si las aceleraciones de gravedad respectivas son 979,5 y 978 cm/s2

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.