Question

the passage below describes a process of scientific inquiry. select the part of the passage that describes revising the hypothesis.
a motorized toy boat moving across a pond
lester took his motorized toy boat to the park with his cousin. the boat zipped across the pond, and lester wondered if adding mass to the boat would affect its speed. he didnt think so, since the motor should keep propelling it at the same rate. lester decided to time the boat as it traveled from one side of the pond to the other. he then taped a pebble to the boat and timed it again. finally, he added a second pebble and repeated the procedure. lester noticed that as he added mass, the trips took longer. the empty boat took the least time to cross the pond, and the boat with two rocks took the longest. lester concluded that adding mass does slow down the boat. he changed his prediction: the motor must provide a set amount of force, so it cant maintain the same speed as more mass is added. he shared his results with his aunt and confirmed that the boats motion

Explanation:

Lester initially thought adding mass wouldn't affect speed. After conducting the experiment and observing the results, he changed his prediction. This change in prediction is the revision of his hypothesis.

Answer:

He changed his prediction: The motor must provide a set amount of force, so it can't maintain the same speed as more mass is added.