1. Four students investigated the effect of gravity on falling objects. The students all used the same three balls and dropped them from a height of 8 meters. They recorded the time it took for each ball to hit the ground. Which student most likely had an error in the results?
(1 point)

Ziva

Jade

Owen

Eduardo

2.A student designs an investigation to study the effect of gravity on objects on Earth. He will use the criteria shown. How can the student improve the investigation?

(1 point)

by dropping the balls from the same height

by using balls that are the same mass

by finding balls made from different materials

by measuring the circumference of the balls