1. What was Swimmer C's average speed? 2. What was Swimmer A's average speed during the period 10 min to 20 min?

4.8 km/hr ;

0

Explanation:

Based on information plotted on the graph :

Distance traveled by swimmer C = 2400 m

Travel time of swimmer C = 30 minutes

Converting distance to km:

2400 m = 2400 / 1000 = 2.4 km

Converting time to hour :

30 minutes = 30 / 60 = 0.5 hour

Average speed = Distance traveled / time taken

Average speed = 2.4 km / 0.5 hour = 4.8 km/hr

2.)

Swimmer A's average speed during the period 10 to 20 minutes ;

Change in distance /change in time

(400 - 400) / (20 - 10) = 0

Hence, distance traveled is 0

answer; /// the above statement is (true);

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.